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"
"to gesture, to signal"
"modern invented variant"
"son of Eric, son of the ever-ruler"
"noble friend"
"tough, strong, resilient"
"chancellor, keeper of records"
"enduring, steadfast"
"hidden store, treasure"
"God is gracious"
"all-knowing, wise"
"sun and sea (Hawaiian compound)"
"young person, noble youth"
"youth-producing"
"from Brittany (Celtic region)"
"lord, warrior who holds land by military service"
"divine smith"
"dark warrior, little dark chieftain"
"remedy, cure"
"resolute fortress, determined will"
"lord of the border territories"
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.