Kirby sits next to 4 phonetic neighbors — Kerby, Gabby, and Libby 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
"church settlement, village with a church"
"high-born, sublime"
"wave"
"diminutive of Josephine"
"pure, unblemished"
"guiding light"
"pure, holy (Latin diminutive suffix used as name)"
"unborn, eternal soul"
"beautiful, lovely"
"gift of God's grace"
"bird-like, avian"
"grace, kindness"
"little rock, harmonious"
"tree, oak tree"
"navigator, of the navy"
"sacred river"
"God answered, God has spoken"
"tower, elevated place"
"gift of God (short form of Dorothy/Theodora)"
"speckled, freckled"
"going up, elevation"
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 kirkja + 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.