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"
"knowledge, sacred wisdom"
"short form of Devon/Devlin"
"the auspicious dark one"
"victory, triumph"
"victory of Sai"
"unique, one without equal"
"all-attractive one (devotional)"
"land of purple, merchant"
"part of Lord Vishnu"
"one who lives long, builder"
"sun"
"a dancing particle of light"
"cosmic creative principle"
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.