Hattie sits next to 5 phonetic neighbors — Mattie, Patty, and Haddie are the closest matches by sound. Most share Hattie's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"home ruler"
"grace, favor"
"Noble, patrician (via Patrick)"
"Exclamation of triumphant discovery"
"farm garden, upper estate enclosure"
"writer, creator of works"
"handsome, fair"
"modern American coinage; possibly echoing Lateran (the Roman hill)"
"noble, of noble birth"
"God is salvation"
"slender; narrow passage"
"dwelling place"
Similar sound: These names share phonetic patterns with Hattie — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic (via Harriet) origins, giving them the same cultural heritage as Hattie.
Rhythm: Hattie is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.