Lucy sits next to 4 phonetic neighbors — Lucia, Lacy, and Lacey are the closest matches by sound. Most share Lucy's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"light, illumination"
"flat tropical grassland"
"fairy maiden, beautiful woman"
"worthy, powerful"
"son of Maud, son of Matthew"
"hidden, concealed"
"torch, bright flame"
"play, amusement"
"lady, queen"
"God is able"
"freedom, grace"
"from the city of Siena"
"rose flower, the plant"
"life"
"daughter of the sun"
"lioness of God"
"patron of musicians, derived from Latin caecus meaning blind"
"weaver, one who weaves"
"grace, favor of God"
"life"
"born of Juno, goddess of marriage"
Similar sound: These names share phonetic patterns with Lucy — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Lucy.
Rhythm: Lucy is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.