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"
"modern American coinage; possibly echoing Lateran (the Roman hill)"
"pledged to God"
"handsome, fair"
"merciful, gracious"
"slender; narrow passage"
"Modern creative formation"
"God is salvation"
"Exclamation of triumphant discovery"
"dwelling place"
"farm garden, upper estate enclosure"
"writer, creator of works"
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.