Indra sits next to 3 phonetic neighbors — Andre, Indira, and Indio are the closest matches by sound. Most share Indra's Indian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"possessor of rain drops"
"celebration, festivity"
"possessing divine grace"
"strong, mighty, powerful"
"being, existence"
"pleasing, charming"
"rule, discipline, restraint"
"born of royalty"
"non-dual, incomparable"
"benevolent one"
"god of war, divine commander"
"one who is filled with happiness"
"noble by birth (archaic)"
"ruler, lord"
"auspicious, benign, propitious"
"wholesome, beneficial"
"always new, ever-fresh"
"split, torn, broken apart"
Similar sound: These names share phonetic patterns with Indra — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Sanskrit origins, giving them the same cultural heritage as Indra.
Rhythm: Indra is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.