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"
"words of a song, poetic"
"petite woman"
"famous in battle"
"of the sun"
"protector of men"
"one who resembles God"
"crooked nose"
"son of Coinneach, the fair one"
"wild rose"
"one's own meadow, Aen's clearing"
"murmuring rock, ambush rock"
"from California (geographic)"
"beloved, wished-for child (from Hebrew Miriam via Mary)"
"torch, radiant"
"child of light"
"origin, beginning, creation"
"bright, shining one"
"shining light"
"caring, without superior"
"pure, maiden"
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.