Board Thread:Naruto Discussions/@comment-26708623-20200816221932/@comment-32685487-20200816225835

It is, the Itachi Shinden Novels are part of a canon timeline to the manga itself. Her name was Izumi Uchiha.

https://naruto.fandom.com/wiki/Izumi_Uchiha

Also Obito was stated to be a descendant of Madara himself, meaning Madara did indeed have kids at one point.

https://1.bp.blogspot.com/-dgR3rxuJQko/XekPVjS2l0I/AAAAAAAAP5M/JkGd0WiRZN4_-0GDREmXM6hkGCsT6jfpgCLcBGAsYHQ/s1600/011.webp