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"
"plum blossom (Mai) + waterfall/lake (Lynn)"
"pledged to God"
"boomerang"
"source of joy, father's delight"
"noble, perfect"
"canary bird"
"land of the Britons"
"who is like God"
"God has enriched/blessed me"
"strength, power"
"gazelle"
"people's triumph"
"black, dark"
"man of prayer"
"hill, mound"
"son of the gray-haired one"
"I rejoice in wealth (short form)"
"she who judges"
"love, affection"
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.