Caspar sits next to 3 phonetic neighbors — Casper, Jasper, and Kaspar are the closest matches by sound. Most share Caspar's German-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"treasurer, keeper of treasure"
"God will add, God increases"
"companion, friend (Old English origin)"
"northerner, man from the north"
"merciful, kind"
"Settlement near the well"
"Fortune, riches"
"nothing (informal)"
"autumn"
"new house"
"son of Andrew"
"divine, godly"
"symbol of limitless abundance"
"guardian of riches"
"fair warrior, white hero"
"modern coinage, no historical meaning"
"modern compound: Mc (son of) + Aiden (little fire)"
"olive tree + man (Greek etymology)"
"checkerboard pattern"
Similar sound: These names share phonetic patterns with Caspar — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Persian origins, giving them the same cultural heritage as Caspar.
Rhythm: Caspar is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.