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"
"heart"
"brave"
"bright, clear, luminous"
"gift of God (via Welsh David)"
"crossroads, cross"
"son of the rock"
"shining with glory"
"he laughs, laughter"
"prince, king"
"defender of men"
"tailor, one who cuts cloth"
"shrine maiden (ceremonial)"
"valley"
"moon, moonlit"
"healer"
"deer, little deer"
"God has remembered"
"victory of the people"
"male deer, strong young man"
"servant, attendant"
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.