Ruthie sits next to 3 phonetic neighbors — Rosie, Ruby, and Roxy are the closest matches by sound. Most share Ruthie's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"compassionate friend, companion"
"pure (via Kayla/Katherine association)"
"little dark one, dark-complexioned"
"God is gracious"
"defender, helper of mankind"
"sweet, pleasant"
"she who destroys the light"
"son of the fair warrior"
"hillside by the pool"
"gift from God"
"beautiful"
"shining one, bright, torch"
"hunter"
"pure"
"weary"
"little one (diminutive suffix)"
"brave, strong, manly"
"one who gathers information, explorer"
"heavenly garland, child of heaven"
"pure, virgin"
"musical harmony, pleasant sound"
Similar sound: These names share phonetic patterns with Ruthie — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew re'ut origins, giving them the same cultural heritage as Ruthie.
Rhythm: Ruthie is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.