Dylam sits next to 5 phonetic neighbors — Dylan, Dillan, and Dillon are the closest matches by sound. Most share Dylam's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"son of the sea, great tide"
"peaceful, gentle"
"from Britain, Briton"
"bearer of Christ, Christ-carrier"
"supplanter, heel-catcher"
"the hay town"
"God is gracious"
"raider, warrior"
"strong and enduring as oak wood"
"the third (in family lineage)"
"place of glamour and royalty (associative)"
"lasting, persistent"
"helpful, from Cody's Irish root"
"enduring, steadfast"
"resolute, bright"
"God has given"
"of the mountain, from the mountain"
"hero of God, man of God"
"white, fair, blessed"
"the sky, abode of God"
Similar sound: These names share phonetic patterns with Dylam — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Welsh origins, giving them the same cultural heritage as Dylam.
Rhythm: Dylam is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.