Stepson

wiktionary

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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”).