Adrien sits next to 3 phonetic neighbors — Adrian, Hadrian, and Damien are the closest matches by sound. Most share Adrien's French-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"man from Hadria"
"beautiful, handsome"
"ruler of all, universal ruler"
"powerful ruler"
"ruler of the sea"
"modern invented name"
"firm, steadfast (metaphorical)"
"from Dayton"
"associated with luxury and elegance"
"goodness of Yahweh"
"will helmet, strong protector"
"the island, island dweller"
"Frenchman, man from France"
"dark settlement (place name)"
"power of the tribe"
"bright fame"
"attainer, one who gains"
"handsome, fair one"
"boundary wood"
Similar sound: These names share phonetic patterns with Adrien — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Adrien.
Rhythm: Adrien is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.