This paper deals with the variation of elative, delative and ablative suffixes appearing in early Hungarian books. The corpus-based study is based on data from the period between 1527 and 1576, composed of 103 texts representing the independent variables selected: the authors' place of birth, the place and date of the edition, the genre, and other characteristics of the texts such as translation vs. original, etc. The variants of each suffix being originally distributed on a regional dialectal basis also show another kind of distribution: the hypothetical spoken and the analysed written forms diverge substantially more from each other than they did earlier (as, e.g., in the previous period, the age of the codices). Analogical levelling produced a clear borderline between the written (especially printed) and the spoken forms. The written forms of the elative, delative and ablative suffixes display mid vowels, whereas their spoken forms involved high vowels at the time. These forms appear in early Hungarian books as a function not of the independent variables chosen, but of the new linguistic medium itself and of its norms being formed.