Latin word quicumque comes from Latin quippe, Latin -cumque (Used to derive indefinite adjectives, adverbs and pronouns.)

Detailed word origin of quicumque

Dictionary entry	Language	Definition
quippe	Latin (lat)	Indeed, in fact, obviously. Surely, certainly, by all means.
-cumque	Latin (lat)	Used to derive indefinite adjectives, adverbs and pronouns.
quicumque	Latin (lat)	Whoever, whatever. Whosoever, whatsoever.

Words with the same origin as quicumque