who (pron.)

Old English hwa "who," sometimes "what; anyone, someone; each; whosoever," from Proto-Germanic *hwas (source also of Old Saxon hwe, Danish hvo, Swedish vem, Old Frisian hwa, Dutch wie, Old High German hwer, German wer, Gothic hvo (fem.) "who"), from PIE root *kwo-, stem of relative and interrogative pronouns.

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Definitions of who from WordNet

who (n.)
a United Nations agency to coordinate international health activities and to help governments improve health services;
Synonyms: World Health Organization / W.H.O.