My country of origin, Faroe Islands, has worked on this precisely because the population is small and very closely related. So there's a lot of recessive genes being expressed. Also, they've kept meticulous population records for centuries, so traits can be accurately traced back through several generations. I just looked up my own records in the national registry and traced one of my branches back to a named person born in the year 1170.

Info: https://www.fargen.fo/en/research/genealogy-registry/