Dallan sits next to 4 phonetic neighbors — Dylan, Dolan, and Allan are the closest matches by sound. Most share Dallan's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"little blind one, the blind one"
"lake, pool, waterfall"
"precious, greatly valued thing"
"God is salvation, Yahweh saves"
"son of (Celtic prefix) + divine"
"lively energy, kicks"
"noble guardian"
"from the mountain"
"settlement by the bridge"
"elm tree grove"
"wooded dune area, hare meadow"
"rope, cord (from Old French 'corde')"
"vast, expansive"
"son of Agnes (pure, holy)"
"God perceives"
"modern creative variant of Jason"
"modern invented name"
"one thousand million, immense wealth"
"swift as a deer"
"helper, warner (if derived from Nazir)"
Similar sound: These names share phonetic patterns with Dallan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Irish Gaelic origins, giving them the same cultural heritage as Dallan.
Rhythm: Dallan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.