köken: From Middle High German phingesten, from Late Latin pentēcostē, from Ancient Greek πεντηκοστή (pentēkostḗ). The Old High German form fimfchusti is a partial calque of the Ancient Greek term, with πεντη- (pentē-) replaced by fimf (“five”). Cognate with Hunsrik Pingste and Dutch Pinksteren.
köken: First attested in 1138. Pinkuʃtí, later Pyncust. Probably from a North Italian language, compare (Comelican) Ladin pentkòsti, Venetan pìntẹkǫ́ṣte and Romagnol pìntikǭ́st. Alternative derivation via Middle Low German pinkesten (cognate to German Pfingsten) is debated as it does not account for word-final -n, unless by reanalysis as superessive. Ultimately from Ecclesiastical Latin pentecoste, from…
köken: From Middle Irish cengciges, from Vulgar Latin *cīnquāgēsima, from Latin quīnquāgēsima (literally “fiftieth”), as Whitsun is the fiftieth day of the Easter season.
From Ecclesiastical Latin Pentēcostē, from Koine Greek πεντηκοστή (pentēkostḗ), from Ancient Greek πεντηκοστή (pentēkostḗ, “fiftieth”), from Proto-Indo-European *pénkʷe (“five; hand”).