A variant of Madison, an English surname meaning son of Maud or son of Matthew in later use.
Maddisson is a variant of Madison, an English surname that originally meant son of Maud and later came to be linked, through later use, with son of Matthew as well. That layered history is typical of surname names that crossed into given-name use and then acquired new associations.
The doubled consonants and extra syllable give Maddisson a more embellished, stylized feel than the standard form. In modern naming, Maddisson fits squarely into the category of familiar names made more decorative through spelling. It sounds approachable and contemporary, but with a slightly softer, more individualized visual identity.
The name also carries the broad unisex-style energy that Madison brought into common use, though the spelling here leans more feminine in appearance. Maddisson is a name of familiar bones and modern styling.