Betty sits next to 4 phonetic neighbors — Betsy, Beth, and Bette are the closest matches by sound. Most share Betty's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"God is my oath"
"noble, high"
"world-encircling river"
"white, holy, blessed ring"
"free man, free woman"
"lily"
"beautiful picture, painted beauty"
"sea"
"high meadow"
"lily of grace"
"life"
"reward, wages"
"heavenly, sky (Polynesian element lani)"
"olive"
"new"
"eternal blossom"
"well-spoken of"
"violet flower"
"sun goddess"
"defender, helper of mankind"
Similar sound: These names share phonetic patterns with Betty — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew origins, giving them the same cultural heritage as Betty.
Rhythm: Betty is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.