The word you need is portmanteau (couple) naming.
Word Origin & [name]History[/name]
1584, “traveling case or bag for clothes and other necessaries,” from M.Fr. portemanteau “traveling bag,” originally “court official who carried a prince’s mantle” (1547), from porte, imperative of porter “to carry” (see porter (1)) + manteau “cloak” (see mantle). Portmanteau word “word blending the sound of two different words,” is 1882, coined by [name]Lewis[/name] [name]Carroll[/name] for the sort of words he invented for “Jabberwocky,” on notion of “two meanings packed up into one word.”
Online Etymology Dictionary, ” 2001 [name]Douglas[/name] [name]Harper[/name]
It’s actually a specific kind of suitcase, but most people (or is it just nerds?) now use it to describe a word that contains parts of two words (like spoon + fork = spork), distinct from a compound word which is a new word made up of two whole words (like play + ground = playground). Portmanteaux have become extremely common in fandom to combine names of couples who exist (real or fictional) or to express their preferred matchups, even if the creator/author doesn’t pair up the two characters (yet or ever).