The article deals with the onomastic space structure in the literary text and its constituents functions in realization of coherency as a text forming category. It is stated that providing global text coherence onyms could represent both denotative coreference and significative coherence of nomination units. The data of the studies have proved that the following units take part in providing text coherency of the novel "The Twelve Chairs" by I. Ilf and E. Petrov: anthroponyms, toponyms, and ergonyms. Having used a frame approach to the proper names analysis the authors could modify and clearly specify a detailed onym functional classification (which is known in linguistics of onyms), pointing to the necessary to distinguish six instead of three groups of onyms according to their functions in providing text coherency: 1) onyms that maintain coherency of the whole text; 2)onyms that construct space-time coordinates of the literary picture of the world; 3) onyms that are both naming the characters who directly interact with the protagonists and designing external relations of the text passage; 4) onyms that organize internal relations of the text passage and represent the main characters of the text passage; 5) onyms that form space-time background of the text passage; 6) optional onyms, which do not play a significant role in the text coherency. With the particular examples the authors proved that some onyms could simultaneously perform different functions forming both external and internal links.