Rulings

• 2009-05-01
  A face-down creature has no name, so it doesn’t have the same name as anything else.
• 2018-12-07
  If Maelstrom Pulse resolves but the target permanent isn’t destroyed (perhaps because it regenerates or has indestructible), all other permanents with the same name as it will still be destroyed.
• 2018-12-07
  The name of a creature token is the same as the creature types it was created with unless the token is a copy of another creature or the effect that created the token specifically gives it a different name. For example, a 1/1 red Elemental creature token created by Young Pyromancer and a 4/4 green Elemental creature token created by Walker of the Grove are both named “Elemental.”
• 2018-12-07
  If the target permanent becomes an illegal target for Maelstrom Pulse, the spell doesn’t resolve. Nothing is destroyed.
• 2018-12-07
  Maelstrom Pulse has only one target. Other permanents with the same name will be destroyed even if they have hexproof or protection.