Less famous people might be found in biographical sources such as those listed below.
Obituaries are often excellent sources of biographical information.
Many biographical works cover only those no longer living. In general, you will find many biographical indexes and encyclopedias with call numbers beginning with CT100-CT3999. Then there are literally hundreds of more specialized handbooks or dictionaries. You can search Socrates for these sorts of materials using the subject index combining the term biography with a country, profession, or field of interest. Encyclopedias, Handbooks, Dictionaries, etc.