Kolby sits next to 3 phonetic neighbors — Colby, Cody, and Koby are the closest matches by sound. Most share Kolby's Scandinavian cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"dark settlement, coal town"
"mourning (symbolic)"
"birth, creation"
"Gomeric's hill"
"Christian cross, symbol of faith"
"pilgrim, palm branch bearer"
"jet aircraft, speed"
"dark settlement (place name)"
"bold place, wild settlement"
"free one"
"peaceful ruler"
"power of the tribe"
"valley, narrow glen"
"bearer of Christ"
"reddish-brown (color)"
"possession, acquisition"
"genuine, bold"
"hero (cultural/gaming)"
"God has given"
"one who hears, God has heard"
"strong as a lion"
Similar sound: These names share phonetic patterns with Kolby — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Norse origins, giving them the same cultural heritage as Kolby.
Rhythm: Kolby is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.