Does naming places after "Pious Saints" (such as Sidi Hussein or Sidi Ammar) and calling out these names to refer to the place, undermine the perfection of Tawhid (monotheism)?

The expression "you reside in the country of my master so-and-so" does not detract from monotheism if it is merely intended to designate a place. However, if there is veneration in the heart for the one after whom the place is named, then there is a concern. The Ummah must correct its beliefs and distance itself from exaggeration concerning the righteous, for that was the cause of polytheism among Noah's people.