Arslan sits next to 4 phonetic neighbors — Aslan, Arlan, and Arlen are the closest matches by sound. Most share Arslan's Turkic-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"lion"
"ruler, sovereign"
"persevering, steadfast"
"those devoted to doing good"
"the divinely guided, one who follows the right path"
"warrior, brave man"
"safe, secure"
"friend, brother"
"judged by God"
"excellence, doing good"
"head of army"
"vow to God, dedicated"
"son of Ay, moon's son (via Turkish)"
"joy, happiness"
"exalted father"
"associated with Al-Khidr, the immortal guide"
Similar sound: These names share phonetic patterns with Arslan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Turkic origins, giving them the same cultural heritage as Arslan.
Rhythm: Arslan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.