A compound of key + set
Proto-West Germanic *kaiju
Old English cǣġ ‘key’
Middle English keye ‘a key’
English key
Proto-Indo-European *sed- ‘to sit’
…
Proto-Germanic *satjaną ‘to set’
Proto-West Germanic *sattjan ‘to set’
Old English settan ‘to set’
Middle English setten ‘to seat’
English set
Today it means
noun An input device whose few keys can be pressed in many combinations, often simultaneously, to enter different commands or characters.
Language periods are conventional ranges, not dates for this word.
Etymograph / keyset
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