Jasper sits next to 3 phonetic neighbors — Casper, Caspar, and Vesper are the closest matches by sound. Most share Jasper's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"treasurer, keeper of treasure"
"great well"
"great king"
"elevated, supreme"
"God is gracious (via John, Jack)"
"the healer (Iason)"
"From the Irish 'Aodhan', a diminutive of Aodh, the Celtic god of fi..."
"benevolent, kind"
"From Hebrew 'Gavriel'; the archangel Gabriel appears in the Bible, ..."
"God's spear"
"born of fire"
"lover of hounds, wolf lover"
"hawk of the plain"
"church official overseeing ten"
"animal enclosure, warren"
"unity; the best; one"
"dark one, black"
"lion (leonem)"
"noble, mighty of God"
"from the brook"
Similar sound: These names share phonetic patterns with Jasper — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Persian origins, giving them the same cultural heritage as Jasper.
Rhythm: Jasper is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.