I can't recall if the word has a singular form. The plural form has a meaning closely analogous to "personal data" and my vague personal recollection is that it ends with an 'i' or an 'a'.
It is not a general word like 'miscellany', 'factoids', 'data', etc. It refers specifically and exclusively to bits of personal information such as name, age, favourite food, etc.
Any help jogging my memory would be much appreciated.
When it came time to introduce himself, James divulged only the basest [word]: his given name, his occupation, and the names of his dogs.