Dillon sits next to 4 phonetic neighbors — Dylan, Dillan, and Dylon 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 tide, son of the sea"
"he who holds firm the good"
"thorny shrub, prickly plant"
"son of Nicholas (via Cole)"
"work and power combined"
"gentle, tamed"
"descendant of the sea warrior"
"loved, beloved"
"open land"
"stone worker (via Mason)"
"dark-haired, tawny"
"wild rose, thorny shrub"
"sea fortress, sea friend"
"famous spear"
"colt keeper, young horse handler"
"gift of God"
"God is gracious (via James/Jacob etymology)"
"leader, military commander"
"deep valley dwellers"
"son of John (via Jack)"
"place of hawks, kite's settlement"
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 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.