Cleo sits next to 4 phonetic neighbors — Clio, Leo, and Theo are the closest matches by sound. Most share Cleo's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"glory, fame"
"wise, knowing"
"soul"
"famous warrior"
"faith"
"brave, strong, manly"
"a narrow path or road"
"pure, clear"
"hill meadow"
"battle glory"
"pure, clear"
"rowan tree (mountain ash)"
"settlement on the ledge"
"moon, light"
"noble, of noble kind"
"eagle"
"little eagle"
"star of the sea (via Mary)"
"noble kind (from Alice)"
"independent spirit"
"love, beloved"
Similar sound: These names share phonetic patterns with Cleo — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Cleo.
Rhythm: Cleo is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.