Harsha sits next to 4 phonetic neighbors — Harsh, Arsha, and Marsha are the closest matches by sound. Most share Harsha's Indian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"joy, delight, happiness"
"well-spoken, fortunate"
"dawn, daybreak"
"gift, blessing"
"noble kind, of noble birth"
"from the valley settlement"
"friend, companion (South Asian usage)"
"full-grown, strong man"
"laurel-crowned"
"settlement by the valley"
"tomorrow"
"joy comes home, joy has arrived at this house"
"dark, rich"
"invented American name with -elvin family phonetic pattern"
"land of the Bretons, from Brittany France"
Similar sound: These names share phonetic patterns with Harsha — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Sanskrit origins, giving them the same cultural heritage as Harsha.
Rhythm: Harsha is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.