This paper presents three case studies using a relational database to investigate the phonology and morphology of Old High German (OHG) nominal forms quantitatively. Results first show that the -iz-/-az-stem class was less clearly defined than handbooks suggest, and that -ir was not yet a general plural marker. Second, for feminine i-stem nouns, the frequency of primary umlaut does not increase over the OHG period, nor does its association with plurality. Third, the study charts the transition of dative plural marking from -um to -Vn during the OHG period.Linguistics, like other sciences, has seen tremendous progress thanks to the creation of new quantitative and computational tools, for instance in corpus linguistics, phonetics and sociolinguistics. Such advances, however, have only recently begun to affect German historical phonology and morphology. Projects such as the ›Mittelhochdeutsches Wörterbuch‹, which provide electronic access to the thousands of tokens that exist for the Middle High period, have already