Hriday sits next to 3 phonetic neighbors — Uday, Aditya, and Hridaan are the closest matches by sound. Most share Hriday's Sanskrit-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"heart"
"a salute, tribute, honor"
"all-wise"
"beauty, grace (Arabic cognate Zayn)"
"part of Vedic scripture; the auxiliary Vedic sciences"
"father is a lamp/candle"
"the letter Z"
"curved, hook-nosed"
"bright, clear"
"courtesy title for an adult man"
"God is salvation"
"little bay, small inlet"
"patience, endurance, perseverance"
"the genuine article"
"king + world (folk etymology)"
"son of Ty"
"land of God (via Marrakesh, Berber origin)"
"language, voice"
"firm of purpose"
"son of the eternal ruler"
Similar sound: These names share phonetic patterns with Hriday — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Sanskrit origins, giving them the same cultural heritage as Hriday.
Rhythm: Hriday is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.