whomever
UK: huːmˈɛvə | US: huːmˈɛvər
pron. the objective case of "whoever," used to refer to any person that; whichever person (formal)
"Whomever" is a compound pronoun formed by combining "whom" (the objective case of "who," from Old English hwām) and "ever" (from Old English ǣfre, meaning "at any time"). The word follows the same pattern as "whoever," but is used strictly in formal contexts where the objective case is required. Over time, "whomever" has retained its grammatical specificity, distinguishing it from the more commonly used "whoever" in modern English.
You may invite whomever you like to the party.
The prize will be awarded to whomever finishes first.
Whomever you choose must be reliable.
She trusted whomever he recommended.
Whomever they appoint will face many challenges.