Halen sits next to 5 phonetic neighbors — Helen, Halyn, and Haven are the closest matches by sound. Most share Halen's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"bright, shining (variant of Helen)"
"noble kind"
"brave, manly"
"pastoral paradise (from Greek Arcadia)"
"modern creative blend of Jay and Liana"
"one from the open heath"
"deep purplish-red color"
"each of the two, pure one"
"extraordinary person remembered in stories"
"member of the Gaut tribe"
"pledge, hostage"
"gift of God (short for Theodore/Theodora)"
"meadow near the hermitage"
"courage, spirit, determination"
"mountain of strength; enlightened"
"of the Livius clan"
"modern invented name"
"meadow, woodland clearing"
"woodland clearing (Locc's meadow)"
"grace (via -anna suffix)"
Similar sound: These names share phonetic patterns with Halen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek via English origins, giving them the same cultural heritage as Halen.
Rhythm: Halen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.