Aleister sits next to 3 phonetic neighbors — Alistair, Alexander, and Alister are the closest matches by sound. Most share Aleister's Scottish cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"defender of men"
"swift, quick"
"hardworking; powerful"
"God will strengthen"
"brown one, the brown bear"
"God has given, gift of God"
"little king"
"spirit of battle"
"horse keeper, stable master"
"glorious protector (as diminutive of Branislav)"
"slender"
"falcon keeper, falconer"
"spark, smoldering fire"
"ruler of the people"
"God is gracious"
"little poet; philosopher"
"the smallest unit of matter"
"bright fame"
"son of the devotee of Saint Fillan"
"from Hadria, near the Adriatic"
Similar sound: These names share phonetic patterns with Aleister — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek Alexandros origins, giving them the same cultural heritage as Aleister.
Rhythm: Aleister is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.