Definition of "euphonym"

But we thought these names were pretty and that they reflected good literary taste. The pets were called by their euphonyms only when visitors were to be properly impressed; consequently, they paid no attention to the meaningless titles.

1969, Joseph Wood Krutch, Paul S. Eriksson, A Treasury of Birdlore, page 195

Many female forenames are regarded as euphonyms. What is and is not euphonious is necessarily subjective, but it could be suggested that names containing labials (b, m), sibilants (s, sh) and liquids (l, r) are more likely to be euphonyms than those that do not.

1996, Adrian Room, An Alphabetical Guide to the Language of Name Studies, page 41

Euphonyms are names that sound good. “Edna Saint Vincent Millay” is an example.

2018, Don L. F. Nilsen, Alleen Pace Nilsen, The Language of Humor: An Introduction, page 233