merman

noun, plural mer·men.

1. (in folklore) a male marine creature, having the head, torso, and arms of a man and the tail of a fish.
2. a highly skilled male swimmer.

noun

1. EthelEthel Agnes Zimmerman, 1909–84, U.S. singer, musical comedy star, and actress.

noun plural -men

1. a male counterpart of the mermaid

n.c.1600, literally “man of the sea,” from first element in mermaid (q.v.) + man (n.).