Jesper sits next to 4 phonetic neighbors — Jasper, Jesse, and Casper are the closest matches by sound. Most share Jesper's Dutch-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"treasurer, keeper of treasure"
"peaceful ruler"
"holly tree"
"counsel, advice"
"yew tree"
"noble ruler"
"strong man"
"will-bright, famous will"
"valley"
"From; of the fen or marshland"
"from Britain, Briton"
"anointed one who carries"
"beloved"
"thunder stone"
"enclosure, yard, garden"
"wealthy, God's gift"
Similar sound: These names share phonetic patterns with Jesper — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Persian via Old French origins, giving them the same cultural heritage as Jesper.
Rhythm: Jesper is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.