Zalen sits next to 3 phonetic neighbors — Zaylen, Zaiden, and Calen are the closest matches by sound. Most share Zalen's Dutch-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"halls, rooms"
"modern invented name (no traditional meaning)"
"peaceful ruler"
"gift of splendor, bounty"
"blessed one"
"son of William"
"fruitful garden, vineyard"
"vigilant in war, son of Cathasach"
"of the wood, forest"
"high mountain, exalted"
"vineyard, fruitful field"
"flat-topped hill settlement"
"invented American name, possibly river (from Zaire)"
"possessing goodness, he who holds firm the good"
"broad hillside"
"pine tree"
"son of Roderick"
"estate of willows"
"moon, moonlit"
"marrow of the sea, sea fortress"
Similar sound: These names share phonetic patterns with Zalen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Dutch origins, giving them the same cultural heritage as Zalen.
Rhythm: Zalen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.