Dilan sits next to 3 phonetic neighbors — Dylan, Dillan, and Dillon are the closest matches by sound. Most share Dilan's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"son of the sea, great tide"
"sea fortress, sea friend"
"praiseworthy, highly commended"
"handsome, cheerful"
"excellence, adornment"
"home ruler"
"God will add, God will increase"
"one deserving of praise"
"son of Neil, son of the champion"
"the pure and selected"
"steadfast, firm"
"beloved"
"beautiful, excellent"
"he shall live"
"ardent lord"
"lion"
Similar sound: These names share phonetic patterns with Dilan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Welsh origins, giving them the same cultural heritage as Dilan.
Rhythm: Dilan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.