you can't rename it? Is it in the Template?
If "widht" is a Shared Parameter, create a Shared Parameter named "width" and replace the"widht" Shared Parameter in all the Families using it with the new "width" Shared Parameter.
NOTE: "Width" is the name of an in-built Revit Shared Parameter. It would not be advisable to create a Custom Shared Parameter of the same name.