From Old English 'pōl' (small body of water), from Proto-Germanic *pōlaz — the 'shared resource' sense is a different word from French.
A small area of still water; a swimming pool; a shared resource.
From Old English 'pōl' meaning 'pool, small body of water,' from Proto-Germanic *pōlaz, possibly from PIE *bōl- (marsh). The gambling 'pool' is a different word, from French 'poule' (hen, stakes). Key roots: *pōlaz (Proto-Germanic: "pool, standing water