stepson

From Middle English stepsone, stepsune, from Old English stēopsunu (“stepson”), from Proto-Germanic *steupasunuz (“stepson”), equivalent to step- + son. Cognate with Saterland Frisian Stäifsuun (“stepson”), West Frisian styfsoan (“stepson”), Dutch stiefzoon (“stepson”), German Low German Steevsöhn (“stepson”), German Stiefsohn (“stepson”), Danish stedsøn (“stepson”), Swedish styvson (“stepson”), Icelandic stjúpsonur (“stepson”).

出典: Wiktionary「stepson」（CC BY-SA 4.0）