köken: From Middle High German vünfzehen, from Old High German fimfzehan, from Proto-Germanic *fimftehun. Equivalent to fünf + zehn. Compare Dutch vijftien, West Frisian fyftjin, English fifteen, Danish femten, Gothic 𐍆𐌹𐌼𐍆𐍄𐌰𐌹𐌷𐌿𐌽 (fimftaihun).
köken: Etymology tree Proto-Indo-European *pénkʷe Proto-Indo-Iranian *pánča Sanskrit पञ्च (pañca) Proto-Indo-European *déḱm̥ Proto-Indo-Iranian *dáća Sanskrit दश (daśa) Sanskrit पञ्चदश (pañcadaśa) Prakrit पण्णरस (paṇṇarasa) Hindi पंद्रह Inherited from Old Hindi पंद्रह (paṃdraha), from Apabhramsa पण्णरह (paṇṇaraha), from Sauraseni Prakrit पण्णरस (paṇṇarasa), from Sanskrit पञ्चदश (páñcadaśa).
From Middle Dutch vijftien, from Old Dutch *vīftēn, *vīftien, from Proto-Germanic *fimftehun. Compare West Frisian fyftjin, German fünfzehn, English fifteen, Danish femten.