Madisonn.

Madisonsurname attested from early 15c., probably in many cases a variant of Mathieson "son of Matthew," but in some cases perhaps "son of Maddy," from the pet form of the fem. proper name Maud. The city in Wisconsin, U.S., was named 1836 for U.S. President James Madison, who had died that year. As the name of a popular dance of 1960, its signification is unknown; supposedly it originated in Baltimore.