Culture references, (or names that just go well and make sense together?)
Examples:
Bonnie and Clyde
Peanut, Butter and Jelly
Abbott and Costello
Trio or Pair Names
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John
Luke
Matthew
Steward (LOL)
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Oh and Mark
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Most of these are going to be historical/mythological references
Caesar and Brutus (I'm sorry, I had to)
Paris and Helen
Alexander and Selene
Gaius, Magnus, and Marcus or Augustus, Antony, and Marcus
Mark and Cleo
Romulus and Remus
Castor and Pollux
Phobos and Deimos
Daedalus and Icarus
(honestly, Greece and Rome have a bunch of good pairs/trios to look at if you want to research more)