Cairo sits next to 5 phonetic neighbors — Kyro, Cyrus, and Kairo are the closest matches by sound. Most share Cairo's Arabic-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"city of a thousand minarets"
"superlative of kallos, beauty"
"sea, ocean (alternate etymology)"
"lily flower"
"woman from Magdala"
"peace, harmony"
"cushion"
"beloved sky"
"desired, longed for"
"dawn"
"eternal ruler"
"crown, laurel"
"grey fortress"
"divine blessing or covenant"
"beautiful"
"dark one, little dark one"
"free woman, petite"
"modern invented Caribbean feminine name"
"beam of light"
"from the surname Payson, New England Puritan heritage"
"noble, of noble descent"
Similar sound: These names share phonetic patterns with Cairo — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Arabic origins, giving them the same cultural heritage as Cairo.
Rhythm: Cairo is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.