Wallen sits next to 4 phonetic neighbors — Wallin, Allen, and Tallon are the closest matches by sound. Most share Wallen's Scandinavian cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"of the valley"
"handsome, well-built, beautiful of form"
"divine bear, god-bear"
"friend, companion"
"skilled, expert, proficient"
"forest, wood, timber"
"modern coined name"
"hunter"
"modern invented name combining Zay and lyn"
"flowing, roaring (from the Rhône river)"
"joyful, jovial (from the same root)"
"that which is about to arrive"
"God is my help, my flock is God"
"noble bear"
"bright, bold (from 'Kash' element)"
"wayfarer, wanderer"
"rocky settlement"
"from Luca, of the light"
"home ruler"
"lyric poetry, song set to the lyre"
"son of the gray-haired one"
Similar sound: These names share phonetic patterns with Wallen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Scandinavian origins, giving them the same cultural heritage as Wallen.
Rhythm: Wallen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.