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"
"clear, evident"
"Yahweh has shown favor"
"of the crooked hill"
"modesty, faithfulness (symbolic)"
"elf ruler with feminine suffix"
"fiery, ardent"
"sun"
"weary"
"sacred, inviolate"
"gift of God"
"wished-for child"
"free man, free woman"
"ascent, going up"
"one who weakens or brings low"
"angelic, messenger of God"
"vigilant, watchful"
"ash tree pool"
"small, humble"
"strong, vigorous"
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.