the word 'whomsoever' is a compound formed within english, building upon the archaic objective pronoun 'whom'. its core, 'whom', originates from proto-germanic 'hwammai', the dative case of the interrogative pronoun, which itself derives from the proto-indo-European root 'kʷo-', the source of most interrogative and relative pronouns across indo-european languages. the addition of the intensifying 'so' and the generalizing 'ever' (both from old english) created a highly formal and emphatic pronoun. this construction follows a pattern seen in other archaic compounds like 'whatsoever' and 'wheresoever', designed to express absolute inclusivity or indefiniteness in a grammatically precise object form, now largely confined to legal, religious, or ceremonial contexts.

Structure: whom + so + ever - whom: from old english 'hwām', the dative case form of 'hwā' (who). functions as the objective/interrogative/relative pronoun base. - so: from old english 'swā' (so, in this way). functions as an intensifying or specifying particle. - ever: from old english 'ǣfre' (ever, always). functions as a generalizing suffix meaning 'any at all'.