Stepfather

wiktionary

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From Middle English stepfader, from Old English stēopfæder, from Proto-Germanic *steupafadēr(“stepfather”), equivalent to step- +‎ father.

Cognate with Saterland Frisian Stäiffoar(“stepfather”), Dutch stiefvader(“stepfather”), German Low German Steevvader(“stepfather”), German Stiefvater(“stepfather”), Swedish styvfar(“stepfather”), Icelandic stjúpfaðir(“stepfather”).

etymonline

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stepfather (n.)

also step-father, Old English steopfæder; see step- + father.