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"
"safe haven, shelter, refuge"
"lapis lazuli (the stone)"
"born of fire (via -vion creative suffix)"
"canyon, deep gorge"
"respect, governance"
"modern blend of Jay + -ren"
"courtesy, respect, gratitude"
"famous shouter, distinguished one"
"bright, splendid"
"from Sebastos (venerable city)"
"God, divine"
"small stream, narrow inlet"
"great, kingly"
"variant of Jason (healer)"
"one who strides, ranger, wanderer"
"beautiful mountain"
"warrior (via samurai resonance)"
"measuring instrument, standard dimension"
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.