Mrs. H.'s Place

A portion of a plat map in Gore C, Grimsby Township, Lincoln County, Ontario, Canada, from the Canadian County Atlas Digital Project at McGill University:

Is Mrs. H. actually Mrs. Mary Howard?  Mary Howard's husband, William Howard, purchased a lot in this area in 1817.

From an earlier In Deeds post:
My ancestor, William Howard, purchased LOT C, East Gore, Township of Grimsby, Lincoln County Ontario, Canada, in 1817.