Dillan sits next to 4 phonetic neighbors — Dylan, Dillon, and Declan are the closest matches by sound. Most share Dillan's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"great tide, sea flow"
"modern blend name"
"blue-green color"
"faithfulness, devotion, steadfast allegiance"
"dedicated to Mars (god of war)"
"song, nightingale"
"who is like God?"
"wealthy, kingly"
"relic of ancestors"
"broad ford, wide river crossing"
"of the Cassius family"
"growth, increase"
"pale, light-skinned"
"Yahweh is gracious"
"white, silver (ancient root)"
"spear warrior, ancient one"
"brave, strong boar"
"hill"
"visitor, pilgrim"
"healer"
"creative phonetic variant of Kaizen"
Similar sound: These names share phonetic patterns with Dillan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Welsh origins, giving them the same cultural heritage as Dillan.
Rhythm: Dillan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.