For the purposes of all rules, abilities, and effects that refer to a card’s name, objects with interchangeable names have the same name. (See rules 201.2a–b.)
April 28, 2017 · Amonkhet
If a player is instructed to choose a card name with certain characteristics, the player must choose the name of a card whose Oracle text matches those characteristics. (See rule 108.1.)
July 22, 2016 · Eldritch Moon
If a player wants to name a split card, the player must choose the name of one of its halves, but not both. (See rule 708.)