Top 10 Metal Bands Where at Least Two Members Have the Same First Names

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Take into account:
1. Number of members with the same names
2. How good the band is
3. Long-term members should be given priority
4. Current members should be given priority
5. Past members should be given priority if they were very important for the band success (Michael Kiske, Timo Tolkki).

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The Top Ten
1 Dark Tranquillity - Martin Henriksson, Martin Brändström; Mikael Stanne, Mikael Niklasson; Anders Jivarp, Anders Fridén Dark Tranquillity is a Swedish melodic death metal band from Gothenburg formed in 1989. They are one of the longest-standing bands from the original Gothenburg metal scene.

Actually 3 pairs:

Martin Henriksson, Martin Brändström (current members)
Mikael Stanne, Mikael Niklasson (current and past)
Anders Jivarp, Anders Fridén (current and past)

2 Blind Guardian - Hansi Kürsch, Hans-Peter Frey; Thomas Stauch, Thomas Kelleners Blind Guardian is a German power metal band formed in the mid-1980s in West Germany. They are often credited as one of the seminal and most influential bands in the power metal and speed metal subgenres. Heavily influenced by Queen, they use the technique of overdubbing. They also incorporate large amounts of orchestral arrangements. Hansi Kürsch creates a huge choir effect by overdubbing his own voice multiple times in complex, overlapping harmonies. Thanks to overdubs and numerous backing vocals Blind Guardian stand out with a very dense sound.

3 pairs, or at least 2 ½ :

1) Hans Jürgen "Hansi" Kürsch, Hans-Peter Frey (current and past member) - they worked together in the 80s

2) Thomas Stauch, Thomas Kelleners (past members) - worked together in the 80s, Thomas Stauch was with the band for 20 years

This may count, too:

MarCus Siepen, MarKus Dörk (current and past member) - MarCus Siepen replaced MarKus Dörk

3 Angra - André Matos, André Hernandes, André Linhares

Not the best band on this list but 3 people named André in a band is pretty amazing. Moreover, the first letters of their names (An) repeat the first letters of the band name - actually 3 common letters out of 5 (a, n, r).
Cool.
They only needed to invite André Olbrich of Blind Guardian and change the band name to André Quatro, or André Quattro Stagioni - to put some classic Vivaldi air to it.

4 Megadeth - Dave Mustaine, Dave Ellefson Megadeth is an American thrash metal band from Los Angeles, California. Megadeth was formed in 1983 by guitarist Dave Mustaine and bassist David Ellefson, shortly after Mustaine was fired from Metallica. They have released 15 studio albums to date, and have gone through many lineup changes, with Dave Mustaine being the sole constant member.

They released their debut album “Killing Is My Business...And Business Is Good!” in 1985, but became successful after the release of “Peace Sells...But Who’s Buying?” in 1986. ...read more.

Current members, long-term members
Born: David Scott "Dave" Mustaine, David Warren "Dave" Ellefson

5 Dream Theater - John Petrucci, John Myung Dream Theater is an American progressive metal band from Boston, Massachusetts. The band was formed in 1985 under the name of "Majesty", only to change its name to Dream Theater later.

The members of the band’s original lineup consisted of John Petrucci (Guitar), John Myung (Bass) and Mike Portnoy (Drums). The band had multiple keyboardists and singers, but as of and since 1991, the band's lead vocalist has been James LaBrie.

The band released their debut album "When Day and Dream Unite" in 1989, but only gained success and notoriety after the release of their second album, "Images and Words" in 1992. ...read more.

Current members, long-term members. Plus Mike Portnoy (ex-member) and Mike Mangini (current member).

Also the only members to have stayed with the band full time.

6 Helloween - Michael Kiske, Michael Weikath Helloween is a German power metal band founded in 1984 in Hamburg, Northern Germany. The band is a pioneering force in the power metal genre, and their second and third studio albums, Keeper of the Seven Keys: Part I and Part II, are considered masterpieces of the genre.

Michael Weikath - founding member, still with Helloween; they worked together long time ago but Michael Kiske was the man who made this band legendary (his voice).

Weikath's songwriting combined with Kiske's vocals made a perfect match... At least for the first two albums with Kiske.

7 Deep Purple - Ian Gillan, Ian Paice

Long-term members, best MK that is also related to metal invention

8 Amon Amarth - Johan Hegg, Johan Söderberg Amon Amarth is a Swedish melodic death metal band from Tumba, formed in 1992. The band takes its name from the Sindarin name of Mount Doom.

Current members, long-term members, together since 1998.

9 Stratovarius - Timo Kotipelto, Timo Tolkki Stratovarius is a Finnish power metal band that formed in 1984. Since their formation, they have released 16 studio albums, 4 DVD and 3 live albums.

A current and a past member but they were together for 14 years

10 Opeth - Martin Lopez, Martin Persson, Martin "Axe" Axenrot, Martín Méndez
The Contenders
11 Fleshgod Apocalypse - Francesco Paoli, Francesco Ferrini, Francesco Struglia Fleshgod Apocalypse is an Italian death metal band. Formed in 2007, the group resides in Perugia and are currently signed to Willowtip Records and Nuclear Blast. The band is known for their fusion of symphonic metal with technical death metal.

Francesco Paoli and Francesco Ferrini are current members, Francesco Struglia is a past member.

12 Edguy - Tobias Sammet, Tobias Exxel Edguy is a heavy metal band from Fulda, Germany that was founded in 1992 by 14-year-old students Tobias Sammet, Jens Ludwig, Dominik Storch and Dirk Sauer.

Current members, long-term members, together since 1998.
Tobias Sammet stopped playing bass in 1998 to focus on vox and songwriting, and Tobias Exxel replaced him on the bass.

13 Iced Earth - John Schaffer, John Greely Iced Earth is an American heavy metal band from Tampa, Florida. It was formed in 1984 under the name Rose, then Purgatory, by guitarist and main songwriter Jon Schaffer, and original drummer Greg Seymour. The band's music has also been described as thrash metal and power metal.

They released their debut album in 1990 and have since released twelve studio albums, four EPs, three compilations,... read more

I felt like adding this. John Schaffer is the guitarist, songwriter, and only full serving member of the band. Whilst John Greeley sang on IE's second album. Which is actually a pretty good album.

14 Marilyn Manson - Brian Warner, Brian Tutunick

This is not metal. Sorry.

15 Voivod - Denis Bélanger, Denis D'Amour Voivod is a Canadian heavy metal band from Jonquière, Québec. Their musical style has changed several times since the band's origin in the early 1980s. The band's current line-up consists of Denis "Snake" Bélanger, Daniel "Chewy" Mongrain, Dominique "Rocky" Laroche and Michel "Away" Langevin.
16 Rolling Stones - Mick Jagger, Mick Taylor The Rolling Stones are an English rock band formed in London in 1962. The first settled line-up consisted of Brian Jones (guitar, harmonica), Ian Stewart (piano), Mick Jagger (lead vocals, harmonica), Keith Richards (guitar), Bill Wyman (bass) and Charlie Watts (drums). Their best works include songs like Paint it Black, Sympathy for the Devil, Satisfication (Which ranked no. 2 in The Rolling Stones Magazine’s best songs of all time list). The Rolling Stones were inducted into the Rock and Roll Hall of Fame in 1989, and the UK Music Hall of Fame in 2004. In 2012, the band celebrated its 50th anniversary.

Nice but not metal. Sorry.

17 Led Zeppelin - John Bonham, John Paul Jones

Nice but not metal. Sorry.

18 Isis - Aaron Turner, Aaron Harris
19 Tankard - Andreas Geremia, Andreas Gutjahr Tankard is a thrash metal band from Frankfurt am Main, Germany, founded in 1982. Along with the bands Kreator, Destruction and Sodom, Tankard is often considered one of the "The Big Teutonic Four" of Teutonic thrash metal.
20 Bullet for my Valentine - Michael Paget, Michael Thomas
21 Diablo Swing Orchestra - Daniel Håkansson, Daniel Hedin
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