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"
"graceful, unique"
"honey, sweet"
"who is like God"
"sparkling, clear gem"
"to ascend, rise, be exalted"
"fiery spark, blaze"
"good speech"
"strength of God (through Uziah)"
"God has answered"
"rose garden"
"divine grace, favor"
"night, dark beauty (Arabic root)"
"feminine form of Jack/Jacques/James"
"free woman, feminine form of Charles"
"beloved, dear"
"brave and powerful work"
"social gathering, party"
"sea warrior"
"God is gracious"
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.