Keller sits next to 4 phonetic neighbors — Kellar, Keeler, and Kella 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"
"pearl"
"word, speech"
"patron of music and musicians"
"bird-like"
"fair, pure"
"heard by God"
"flowing, from the river"
"grey fortress"
"full of life, vibrant"
"hillock, knoll"
"victory of the people"
"beautiful"
"pure, clear"
"God will add, may He add"
"from the woodland clearing"
"curly-haired"
"noble, distinguished"
"valley + lake, meadow-pool"
"little honey, sweet one"
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.