Coulter sits next to 4 phonetic neighbors — Colter, Colt, and Coulter are the closest matches by sound. Most share Coulter's Scottish cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"knife, cutting blade of a plow"
"short form of Isaac"
"steward, estate guardian"
"bent grass clearing"
"harmony, one"
"from Brittany (Celtic region)"
"measured flow, regular beat"
"wolf power, strong guardian"
"to care for, to cherish"
"strength, power, courage"
"to guard, to protect"
"God establishes"
"bright water, clean stream"
"light, bringer of light"
"invented modern blend name"
"not known, unidentified"
"strong warrior-man"
"of the earth, ground"
"falcon keeper, falconer"
"meadow valley, low ground"
"ancestors relic, heir"
Similar sound: These names share phonetic patterns with Coulter — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English/Latin origins, giving them the same cultural heritage as Coulter.
Rhythm: Coulter is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.