English
elsewhom
From else + whom.
Proto-Indo-European *h₂el- ‘other’
…
Proto-Germanic *aljas ‘of another’
Proto-West Germanic *alljas ‘else’
Old English elles ‘other’
Middle English ells
English else
Proto-Indo-European *kʷ- ‘the primary interrogative root’
…
Proto-Germanic *hwaz ‘who’
Proto-Germanic *hwammai
Old English hwām
Middle English whom ‘who’
English whom
The story
Attested since 1542, but rare; modern uses seem like nonces patterned on elsewhere.
Today it means
pron Someone else, anyone else.
Language periods are conventional ranges, not dates for this word.
Etymograph / elsewhom