Darius sits next to 4 phonetic neighbors — Darian, Marius, and Arius are the closest matches by sound. Most share Darius's Persian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"he who holds firm the good"
"modern invented name"
"God is salvation, Yahweh saves"
"God is gracious"
"healer"
"enduring and beautiful"
"divine power (from Oswald)"
"son of the right hand"
"from the roe deer land"
"renowned warrior"
"Brixis settlement"
"Botolph's town, market town"
"famous warrior"
"lover of hounds, hound-desiring"
"brave warrior (later folk etymology)"
"descendant of the sea warrior"
"ardor, enthusiasm, fierceness"
"my strength is Yahweh"
"son of the victor"
"supplanter, one who follows"
"beloved companion"
Similar sound: These names share phonetic patterns with Darius — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Persian origins, giving them the same cultural heritage as Darius.
Rhythm: Darius is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.