Harriet sits next to 4 phonetic neighbors — Henrietta, Hattie, and Harriette are the closest matches by sound. Most share Harriet's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"home ruler, estate ruler"
"goddess of spring, month of May"
"hawk-like (possible alternative)"
"mountain of whiteness"
"star, goddess of stars"
"night, dark beauty"
"flat tropical grassland"
"fair, righteous"
"crooked mouth"
"descendant of Cathasach"
"mortal princess loved by Zeus (mythological)"
"place of the La Ramee family"
"ruler of the land"
"lapis lazuli, sky blue"
"elevated place, great one"
"high meadow"
"curly-haired, descendant of Caiside"
"the desired one"
"son of Ellis, descendant of Elias"
"helpful one"
"from India; the Indus River"
Similar sound: These names share phonetic patterns with Harriet — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic via French origins, giving them the same cultural heritage as Harriet.
Rhythm: Harriet is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.