Sinner

wiktionary

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From Middle English synnere, seneȝere, from Old English *synġere, *synnere, from Proto-Germanic *sundārijaz(“sinner”), equivalent to sin +‎ -er. Cognate with Saterland Frisian Säänder(“sinner”), West Frisian sûnder(“sinner”), Dutch zondaar(“sinner”), German Low German Sünder, Sünner(“sinner”), German Sünder(“sinner”), Danish synder(“sinner”), Swedish syndare(“sinner”), Icelandic syndari(“sinner”).

etymonline

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sinner (n.)

mid-14c., agent noun from sin (v.). Old English had synngiend in this sense.