Aleksander sits next to 4 phonetic neighbors — Alexander, Alejandro, and Alastair are the closest matches by sound. Most share Aleksander's Polish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"defender of men"
"man of the people"
"rowan tree"
"from the Germanic people"
"home ruler, lord of the house"
"victory of the people"
"safe, unharmed (proposed etymology)"
"incomparable to God"
"throne"
"father of peace"
"God is gracious"
"one who guards treasure"
"brave as a lion"
"to close, knot"
"small gift of God"
"sweet-smelling resin"
"firm, unwavering"
"flower"
"god spear"
"follower of Dionysus, god of wine"
Similar sound: These names share phonetic patterns with Aleksander — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Aleksander.
Rhythm: Aleksander is a 4-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.