Dillon sits next to 4 phonetic neighbors — Dylan, Dilan, and Dillan are the closest matches by sound. Most share Dillon's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"great sea, son of the sea"
"breeze, wind"
"powerful in battle"
"party, celebration"
"grace, favor"
"little bird"
"spring meadow (May + Leigh)"
"battle woman, warrior"
"heavenly, of the sky"
"messenger of the gods"
"heavenly, of the sky, royal"
"to be full, abundant"
"of noble character (from aethel)"
"crystal, clear as ice"
"rye clearing"
"ruler of the home"
"queen"
"from the mahogany grove"
"brave lion"
Similar sound: These names share phonetic patterns with Dillon — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Welsh 'dy' + 'llanw' origins, giving them the same cultural heritage as Dillon.
Rhythm: Dillon is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.