Examples
“Council, that all vessels under a neutral or friendly flag, being neutral or friendly property, shall be permitted to import into any port or place in Her Majesty's dominions all goods and merchandize whatsoever, to whomsoever the same may belong, [217] and to export from any port or place in her Majesty's dominions to any port not blockaded, any cargo or goods, not being contraband of war, or not requiring a special permission, to _whomsoever the same may belong_.”
“I am a true democrat and I'm voting whomsoever is the democrat nominee ..”
“Sadly not – as with followers of Marx, Jesus, King, Mohamed or whomsoever is your philosopher of choice, words and deeds are a much stronger indicator of what floats your boat than whose's party you attend.”
“We will not create the opportunity for the mischief - makers wilfully to label whomsoever they wish as secret agents of the apartheid system.”
“Writing in his weekly newsletter, published on the ANC's website, he said such "mischief-makers" would not be given the opportunity to wilfully label whomsoever they wished as secret agents of the apartheid system.”
“We will not create the opportunity for the mischief-makers wilfully to label whomsoever they wish as secret agents of the apartheid system.”
“Yea, hence it appears that they are not under the law, but under grace; for these fruits of the Spirit, in whomsoever they are found, plainly show that such are led by the Spirit, and consequently that they are not under the law, as v. 18.”
Commentary on the Whole Bible Volume VI (Acts to Revelation)
“Faith, in whomsoever it exists, takes hold of the same precious Saviour, and applies the same precious promises.”
Commentary on the Whole Bible Volume VI (Acts to Revelation)
“We appeal to them, by their voice pronounced in the forms of law, to call whomsoever they will to the high post of Chief Magistrate.”
“Again she listened, and there was, sobbing and sighing in the greatest grief, and she thought she heard it louder than ever, only that this time it seemed to name whomsoever it was lamenting.”
Lists
These user-created lists contain the word ‘whomsoever’.
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Conjunctivitis
Unholy adverbose conjunction trinities. Yes, this list is ridiculous.
whomsoever, whilstsomewise, whichsoever, whichwherewise, whereoflike, whereinsoever, whereforemore, wherehapssuch, whereinas, whereasupon, whenwhereof, whencesoever and 87 more...

sydiswatching1 "If I'd done you one from last year, it would look to you like some sort of infant's random stabs on a keyboard, and to you, who use whomsoever as a subject."
-Infinite Jest, David Foster Wallace Sep 19, 2009