> From Middle English pol, polle ("scalp, pate"), probably from or else cognate with Middle Dutch pol, pōle, polle (“top, summit; head”),[1] from Proto-Germanic *pullaz (“round object, head, top”), from Proto-Indo-European *bolno-, *bōwl- (“orb, round object, bubble”), from Proto-Indo-European *bew- (“to blow, swell”).
Akin to Scots pow (“head, crown, skalp, skull”), Saterland Frisian pol (“round, full, brimming”), Low German polle (“head, tree-top, bulb”), Danish puld (“crown of a hat”), Swedish dialectal pull (“head”). Meaning "collection of votes" is first recorded 1625, from notion of "…