Sidharth sits next to 5 phonetic neighbors — Siddharth, Siddhartha, and Sidarth are the closest matches by sound. Most share Sidharth's Indian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"one who has accomplished his goal"
"immortal, eternal"
"a ray of the sun, sunbeam"
"One who is beyond comparison; the only one of its kind"
"the broad one"
"soul, consciousness, the innermost self"
"love, pure affection"
"mighty, strength, warrior"
"the archer, destroyer with arrows"
"moon, luminous, shining"
"virtuous, pure, truthful"
"sky, open space, atmosphere"
"growing, developing"
"spiritual brilliance, inner light"
"golden, of good complexion"
"of the mountains, highland"
Similar sound: These names share phonetic patterns with Sidharth — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Sanskrit origins, giving them the same cultural heritage as Sidharth.
Rhythm: Sidharth is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.