Arlen sits next to 5 phonetic neighbors — Arlene, Arline, and Arlen are the closest matches by sound. Most share Arlen's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"pledge, oath, solemn promise"
"To build, to construct"
"beautiful, precious"
"powerful, mighty"
"beloved, wished-for child"
"ugly head (literal Old Irish)"
"miraculous wonder, divine marvel"
"beauty, glory, splendor"
"place by the sea (possible Kumeyaay origin)"
"jasmine flower"
"little hollow in the land"
"helpful one, descendant of the helpful one"
"channel, waterway"
"cloud, mist, fog"
"God is my light"
"the azalea flower"
"azure, referring to the Azores islands"
"lion of God"
"curved throwing stick"
"intensely fragrant"
"corn meadow (maize + ley)"
Similar sound: These names share phonetic patterns with Arlen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Irish Gaelic origins, giving them the same cultural heritage as Arlen.
Rhythm: Arlen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.