Sinyar, an alleged Central Sudanic language of Western Darfur, is characterized by two distinct and complementary case marker (sub)systems, the distribution of which provides a morphosyntactic justification of the distinction between common nouns and proper names. The paper considers the two case marking types as well as the semantic content of the category of names. It further presents and tries to explain the behavior of several nouns that may also be marked as names. It finally reviews two types of units that show formal affinities with the marking of names, namely absolute locative nouns on one side, and demonstratives and personal pronouns on the other side.