Alastor sits next to 4 phonetic neighbors — Alistair, Alister, and Castor are the closest matches by sound. Most share Alastor's Greek-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"avenger, one who does not forget"
"son of the home ruler"
"people's lord"
"advice, counsel"
"tempest, violent storm"
"consecrated, sacred"
"fortified place, protection"
"armed host, military force"
"uncertain, possibly warrior spirit"
"fiery, ardent"
"first, beginning"
"independent, free-spirited"
"elder, respected one"
"rapid water"
"enlightenment, awakening"
"from Airelle (a place in Normandy)"
"glory-power"
"land, territory"
"prosperous ruler"
"fortified camp, military settlement"
"son of Ellis"
Similar sound: These names share phonetic patterns with Alastor — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Alastor.
Rhythm: Alastor is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.