Lettie sits next to 3 phonetic neighbors — Betty, Netty, and Lottie are the closest matches by sound. Most share Lettie's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"joy, happiness, gladness"
"princess of the water"
"crown of laurels"
"my God is an oath, pledged to God"
"abundance"
"beautiful rose"
"pleasant meadow"
"torch, radiant light"
"princess, noble lady"
"steward, manager"
"star that suddenly brightens"
"angelic, messenger of God"
"who is like God?"
"my God is the Lord (via Hebrew Elijah)"
"open plain"
"royal fortress meadow"
"joyful"
"clear as ice, pure"
"alive, vibrant"
"spiritually renewed"
"child of heaven"
Similar sound: These names share phonetic patterns with Lettie — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Lettie.
Rhythm: Lettie is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.