Arlan sits next to 5 phonetic neighbors — Arlen, Harlan, and Darlan are the closest matches by sound. Most share Arlan's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"pledge, oath"
"from the deep valley, Devon land"
"powerful ruler"
"battle, warrior chief"
"modern invented name"
"nickname for Charles"
"head, chief (as in penultimate)"
"pale, light-skinned"
"from the badger settlement"
"who is like God?"
"resolute fortress, determined will"
"jay bird + Latin -ian suffix"
"god of thunder and strength"
"beloved, dear one"
"brushwood town"
"hill, marshland"
"increase, wisteria"
"halls, rooms"
"possessor, acquirer"
"rope maker"
"goodness of God"
Similar sound: These names share phonetic patterns with Arlan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Irish origins, giving them the same cultural heritage as Arlan.
Rhythm: Arlan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.