Parameter URL with space in Column Name

I am having a problem passing parameters to a url when the Column name has a space in it.  But when there is no space in the column name there is no issue.  Please advise ?filter=Tablename/Column name eq 'Passed Value' is the format I am using

Variables

Tablename = RDash

Column1 = Vendor

Column2 = Vendor Name

?filter=RDash/Vendor eq 'My Company' this works

?filter=RDash/Vendor Name eq 'My Company' this doesn't works

TIA

Any advice?  Do I need to rename my columns and possibly other tables to remove the spaces for this to work?