Erlin sits next to 3 phonetic neighbors — Erling, Erin, and Arlen are the closest matches by sound. Most share Erlin's Scandinavian cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"eagle, nobleman"
"occupational name for a burner of coal or lime"
"the greatest"
"ruler of the home, home power"
"born of laughter, joy"
"God is good"
"day"
"defender of the people, protector of men"
"renowned power"
"laughter (as a gift from God)"
"Thor's stone"
"God is my judge (short form of Daniel)"
"stern, severe, serious"
"gift of Yahweh"
"one who bakes (occupational surname)"
"shining from the north"
"hat maker, cap maker"
"hollow stone, hollow hill"
Similar sound: These names share phonetic patterns with Erlin — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Norse ern/jarl origins, giving them the same cultural heritage as Erlin.
Rhythm: Erlin is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.