Kirby sits next to 4 phonetic neighbors — Kirk, Derby, and Colby are the closest matches by sound. Most share Kirby's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"settlement by a church, church village"
"blond, white, bright one"
"bold, brave, daring"
"modern variant of Daxton"
"little seal"
"wealthy, kingly"
"God has healed"
"man of the forest"
"bright fame"
"oak tree"
"settlement on the ridge, keel town"
"trout (from the fish's spotted pattern)"
"modern invented name"
"poet, bard"
"modern invented name (no traditional meaning)"
"modern invented compound name"
"son of Rhys, son of the ardent one"
"the Christian cross"
"son of Japheth, ancestor of Greeks"
"wave"
"God supports"
Similar sound: These names share phonetic patterns with Kirby — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Norse kirkr + byr origins, giving them the same cultural heritage as Kirby.
Rhythm: Kirby is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.