Crosby sits next to 3 phonetic neighbors — Cosby, Rosby, and Grady are the closest matches by sound. Most share Crosby's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"village with a cross, crossroads settlement"
"rowan tree"
"beloved one"
"Hawaiian deity, sacred power"
"beautiful Mary, bitter beauty"
"most beautiful, fairest of all"
"lawsuit, judgment"
"Scandinavian form of Christine, anointed"
"birch tree meadow, birch wood clearing"
"modern coinage with divine suffix"
"joyful, lively"
"elm grove"
"woman of Judea"
"who is like God, crown"
"attendant of God, God has prevailed"
"flat tropical plain"
"from the city of Venice; the Veneti people"
"beloved, wished-for child"
"refuge, shelter (from Hebrew azilah)"
"from Arcy"
"joyful, lively (phonetic suggestion)"
Similar sound: These names share phonetic patterns with Crosby — 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 Crosby.
Rhythm: Crosby is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.