Vesper sits next to 5 phonetic neighbors — Casper, Jasper, and Esper are the closest matches by sound. Most share Vesper's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"evening star"
"sea (if Kai origin)"
"pure (via Katherine variant)"
"olive, peace"
"little warrior, warlike"
"ruler of elves (Avery root)"
"from the Everley place name"
"lily flower"
"combination of Shay (Irish) and lee (meadow)"
"bright, clear, famous"
"invented name from Mortal Kombat character"
"joy, delight, happiness"
"slender and fair"
"bright, shining one"
"fond of horses (philos + hippos)"
"bright, radiant"
"wren, small bird"
"from Massy, France (place name origin)"
"flax clearing"
"sparkling, clear gem"
Similar sound: These names share phonetic patterns with Vesper — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Vesper.
Rhythm: Vesper is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.