Millan sits next to 4 phonetic neighbors — Milan, Millen, and Dylan are the closest matches by sound. Most share Millan's Spanish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"dear little one, devotee"
"God will increase, God will add (José)"
"man of Rome, from Rome"
"sixth"
"chief, spear warrior"
"eagle wolf"
"three-leafed symbol of fortune"
"dear, beloved"
"divine gift, blessing from God"
"praised, lauded"
"bright fame"
"given, gift"
"wealth, fortune, prosperity"
"anointed one"
"father of many"
"God is my strength"
"barn for cows, cowshed"
"famous ruler, glory + power"
"chief lord, noble leader"
"powerful in battle (alternate interpretation)"
Similar sound: These names share phonetic patterns with Millan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Celtic / Latin origins, giving them the same cultural heritage as Millan.
Rhythm: Millan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.