Azul sits next to 3 phonetic neighbors — Azure, Azuul, and Azu are the closest matches by sound. Most share Azul's Spanish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"blue"
"song, nightingale"
"guardian, protector"
"lion"
"modern invented name, associated with key and warrior elements"
"light, bringer of light"
"open, wide"
"pillar, cornerstone"
"of the Aelius family"
"noble, honorable"
"red earth, ground"
"God is gracious"
"from the mountains"
"wrathful"
"fertile, productive"
"lion, strong and steadfast"
"brave, strong"
"whole, complete"
"the pure, the selected"
"increasing, growing, abundance"
Similar sound: These names share phonetic patterns with Azul — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Spanish from Arabic lazaward origins, giving them the same cultural heritage as Azul.
Rhythm: Azul is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.