Kelly sits next to 4 phonetic neighbors — Kelley, Kell, and Kellan are the closest matches by sound. Most share Kelly's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"bright-headed warrior"
"cloud"
"of the angel, messenger of God"
"gift"
"fortress, walled Roman camp"
"son of Jack"
"fair-haired, blonde head"
"short form of Devon/Devlin"
"rowan tree"
"born at dawn, of the light"
"canal worker, church official"
"brave power"
"stubborn one"
"thankful, grateful"
"from the pool or marsh"
"craftsman who works with metal"
"steep hill meadow"
"elf friend, noble friend"
"son of Adam"
Similar sound: These names share phonetic patterns with Kelly — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Irish origins, giving them the same cultural heritage as Kelly.
Rhythm: Kelly is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.