Rey sits next to 4 phonetic neighbors — Ray, Rei, and Rae are the closest matches by sound. Most share Rey's Spanish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"king"
"ruler of the people"
"new house"
"merciful, gentle"
"from Mauritania"
"wise protector"
"measure, measurement tool"
"ruler, sovereign (from Julius Caesar's name)"
"estate of the fifth son"
"of golden complexion"
"brave, bold"
"Lord (via Kyrie element)"
"from the city of Dax"
"large homestead, great settlement"
"descendant of the sea warrior"
"wealth, fortune"
"from the roe deer land"
"wealthy guardian, guardian of fortune"
"gift of the Lord"
"descendant of Madan (little dog)"
Similar sound: These names share phonetic patterns with Rey — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Spanish origins, giving them the same cultural heritage as Rey.
Rhythm: Rey is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.