Madden sits next to 5 phonetic neighbors — Aidan, Caden, and Hayden are the closest matches by sound. Most share Madden's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"descendant of Madan (little dog)"
"candle maker or seller"
"wise protector"
"bald (short for Calvin from Latin Calvinus)"
"stone clearing, rocky glade"
"merciful, gentle"
"appointed, placed by God"
"plow blade maker or user"
"greater, superior"
"traveler, one who leaps"
"settlement at the inhospitable place"
"plum tree (unrelated homophone)"
"loyal"
"son of Otto"
"exalted father"
"fire (Irish equivalent Aodh)"
"foot soldier"
"ash tree settlement"
"son of the army ruler"
"wise protector"
"continuous improvement"
Similar sound: These names share phonetic patterns with Madden — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Irish Gaelic origins, giving them the same cultural heritage as Madden.
Rhythm: Madden is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.