Part of speech: Noun
United States singer who appeared in several musical comedies (1909-1984)
Part of speech: Noun
half man and half fish; lives in the sea
Categories: Imaginary being, Imaginary creature
Ethel merman, Merman
The word "merman" comes from Old English *meremann, which comes from Middle English mereman. Many other languages have similar words:
mer- – A related word in the same word family.
man – A related word in the same word family.
The same PIE root can look completely different in modern languages due to thousands of years of sound changes.