IPA: /huˈɛvər/
KK: /huˈɛvər/
Any person or people, regardless of who they are.
Whoever finishes the race first will win a prize.
Whoever is formed from "who" (from Old English "hwā", meaning a person or people) and "-ever" (an adverbial suffix meaning at any time or in any case). The word "whoever" refers to any person who may be involved or considered in a situation.
Think of 'who' as referring to a person and '-ever' meaning at any time. This helps you remember that 'whoever' means any person at all.