Kepler sits next to 4 phonetic neighbors — Keller, Keefer, and Kemper are the closest matches by sound. Most share Kepler's German-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"hat maker, cap maker"
"gift from God, he who is sent"
"supplanter, one who grabs the heel"
"son of Grace, gracious one"
"life"
"beloved, dear"
"young male, beloved son"
"mighty as a bear"
"ocean, sea (from Kai)"
"open field, cultivated land"
"iron blazing, battle warrior"
"rye land, land of rye"
"descendant of the earl"
"royal divine spark"
"modern phonetic invention"
"the fast one, arrow"
"supreme strength"
"combination of ke- (prefix) and Marion (beloved)"
"merchant, trader"
"compassion, forgiveness, clemency"
"charming scoundrel, lovable rebel"
Similar sound: These names share phonetic patterns with Kepler — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have German origins, giving them the same cultural heritage as Kepler.
Rhythm: Kepler is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.