Keller sits next to 4 phonetic neighbors — Kellan, Kellor, and Keller are the closest matches by sound. Most share Keller's German-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"cellar keeper, wine steward"
"famous in battle"
"ruler of peace"
"badger settlement"
"my brother is high, noble"
"hollow land (alternative)"
"throne"
"bear"
"strong as an eagle"
"just, righteous, upright"
"from the pool or marsh"
"free man, strong man"
"scholar"
"modern invented name"
"resolute protector (if variant of Liam)"
"from the River Irvine"
"invented name; possibly son of the fearless one"
"invented modern American name"
"deep gorge, ravine"
"invented modern name"
"brave spear, strong with a spear"
Similar sound: These names share phonetic patterns with Keller — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have German origins, giving them the same cultural heritage as Keller.
Rhythm: Keller is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.