Aleksandar sits next to 4 phonetic neighbors — Alexander, Alexandru, and Aleksander are the closest matches by sound. Most share Aleksandar's Slavic cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"defender of the people"
"life"
"goddess of night, primordial deity"
"devoted to Demeter, follower of the earth goddess"
"defender of men, protector of the people"
"thin-lipped"
"eagle, golden eagle"
"lion"
"immortal, undying"
"my God is Yahweh"
"battle, fighter, combatant"
"God saves, salvation"
"stone marker, boundary"
"son of Aphrodite, Sicilian king"
"diminutive form of Zachariasz (God has remembered)"
"blind one (folk etymology)"
Similar sound: These names share phonetic patterns with Aleksandar — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Ancient Greek origins, giving them the same cultural heritage as Aleksandar.
Rhythm: Aleksandar is a 4-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.