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"
"the rightly guided one"
"pillars, foundations"
"associated with Al-Khidr, the immortal guide"
"son of Ay, moon's son (via Turkish)"
"judged by God"
"warrior, brave man"
"father of many nations"
"persevering, steadfast"
"prince, commander (related form)"
"the righteous ones, the pious"
"ruler, sovereign"
"trustworthy, reliable"
"the one who is firm"
"leader, commander, chief"
"khan, leader of a tribe"
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.