Madden sits next to 4 phonetic neighbors — Madison, Maddox, and Hadden 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
"little hound, little dog"
"bright fame"
"from the heathered meadow (as short for Hadley)"
"God is gracious"
"gift, generous"
"heavenly, of the sky"
"sea breeze, trade wind"
"born at Christmas"
"from Hadria (short for Adriaan)"
"gods will, divine wonder"
"warrior maiden who escorts the dead"
"knowledge, sacred wisdom"
"dove bird, symbol of peace and love"
"noble strength"
"alive, living, lively"
"Irish form of Mary, beloved"
"traveler through the forest"
"invented Valyrian name, no literal meaning"
"fairy queen"
"dew of the sea (rosemary herb)"
"land of the Aryans"
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 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.