mermin

The story

1. Old English · inherited frommeremennen
2. Middle English · inherited frommereminne
3. English todaymermin

From Middle English mereminne, from Old English meremennen, meremenin (“siren”), equivalent to mer- + man. Cognate with Middle Dutch merminne, Middle Low German merminne, Middle High German mereminne, merminne (“mermaid”) and Norwegian Nynorsk mareminne (“mermaid”). More at merman.