Dallen sits next to 4 phonetic neighbors — Dylan, Dallas, and Dalton are the closest matches by sound. Most share Dallen's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"valley dweller, from the meadow"
"new house, bright place"
"bright will, shining desire"
"one who lives by hawthorn bushes"
"warrior in the field"
"he to whom it belongs"
"moon, moonlight"
"from Rome, Roman citizen"
"God the most high (via Omari)"
"hare's valley, valley of hares"
"shining, radiant, brilliant"
"small forest grove"
"red-haired, auburn-haired"
"bear king"
"modern invented name"
"thankful, he will judge"
"new house"
"night"
"young, youthful"
"little Hugh, small-hearted one"
Similar sound: These names share phonetic patterns with Dallen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Scottish Gaelic origins, giving them the same cultural heritage as Dallen.
Rhythm: Dallen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.