cuidam
cuidam is a Latin form of quidam, meaning “a certain, someone”. It is the dative singular masculine pronoun.
Found 84 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 5.48.3: Tum cuidam ex equitibus Gallis magnis praemiis persuadet uti ad Ciceronem epistolam deferat.
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.