Adnan sits next to 4 phonetic neighbors — Adnaan, Hassan, and Amman are the closest matches by sound. Most share Adnan's Arabic-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"settler, one who stays in a place"
"prophet-king of wisdom"
"eternal, immortal, everlasting"
"may God add (children, blessings)"
"one who removes sins, pure-hearted"
"support, backbone"
"growth, abundance, increase"
"friendliness, sociability"
"merciful, compassionate"
"safe, secure"
"exalted, high, noble"
"one who knocks"
"lush, well-watered, abundant"
"skilled, expert, proficient"
"crown, diadem"
"O human being (one interpretation)"
"life-giving"
"iron"
Similar sound: These names share phonetic patterns with Adnan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Arabic origins, giving them the same cultural heritage as Adnan.
Rhythm: Adnan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.