Where does “Martens” come from?

Martens (Dutch) comes from English marten, from Middle English martren, from Old French martrine, from Old Dutch marthrīn, from Old Dutch marthar — marten.

Ancestry of “Martens”, step by step

Martens traces back through two separate lines of ancestry.

via English marten

StepLanguageWordMeaning
1EnglishmartenAny carnivorous mammal of the genus "Martes" in...
2Middle Englishmartren
3Old Frenchmartrinemarten fur
4Old Dutchmarthrīnof marten fur
5Old Dutchmartharmarten

via Dutch S

StepLanguageWordMeaning
1DutchS
Every word from Old Dutch marthar