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"
"fragrant spice"
"bear"
"beautiful and good"
"corner, nook"
"He enlightens, God illuminates"
"venerable, worthy of reverence"
"fingernail, claw"
"land near the court"
"helpful, from Cody's Irish root"
"Lord have mercy"
"song; nightingale"
"God is gracious"
"modern invented name with Ry- prefix"
"high, noble, exalted"
"craftsman, smith"
"stone, solid mass"
"at the mountain"
"faithful one"
"wheel maker, cartwright"
"invented modern name, possibly blade-valley"
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.