The word 'whom' is a direct descendant of the Old English dative and accusative form 'hwām', which itself evolved from the Proto-Germanic interrogative pronoun hwammai. This Proto-Germanic root can be traced further back to the Proto-Indo-European interrogative stem kʷo-, which also gave rise to the Latin 'quem' and the Greek 'τίνα' (tina). In English, 'whom' has historically served as the objective case form of 'who', specifically marking the recipient of an action or the object of a preposition. While its usage has declined in informal speech in favor of 'who', it remains a formal marker of grammatical case, preserving a distinction that has been largely lost elsewhere in the English pronoun system.

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