Mahdi sits next to 4 phonetic neighbors — Mehdi, Madhi, and Madi are the closest matches by sound. Most share Mahdi's Arabic-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"one guided by God"
"dark-haired"
"pure, righteous (as a title of the Prophet)"
"the almighty (divine attribute)"
"rare, extraordinary"
"manifest, apparent, visible"
"may He (God) add"
"his peace, his wholeness"
"little fire"
"one who knocks"
"crown"
"man of peace, peaceful one"
"throne"
"master, lord, chief"
"settler, one who stays in a place"
"owner, possessor"
"blessed, enjoying divine grace"
Similar sound: These names share phonetic patterns with Mahdi — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Arabic origins, giving them the same cultural heritage as Mahdi.
Rhythm: Mahdi is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.