Rudra sits next to 3 phonetic neighbors — Rudra, Indra, and Rudra are the closest matches by sound. Most share Rudra's Indian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"the fierce one, the roarer"
"shining, radiant, ruling"
"solar deity, Surya"
"forest, garden"
"all-attractive one (devotional)"
"short form of Devon/Devlin"
"unique, one without equal"
"one who lives long, builder"
"the victorious one"
"victorious"
"a dancing particle of light"
"the auspicious dark one"
"knowledge, sacred wisdom"
Similar sound: These names share phonetic patterns with Rudra — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Sanskrit origins, giving them the same cultural heritage as Rudra.
Rhythm: Rudra is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.