Josselyn in RootsWeb surname mailing lists. Josselyn genealogy mailing list for correspondence and sharing of information pertaining to family histories of the Josselyn surname and its variations. Or check the index of mailing lists for a sound-alike name.osselyn Genealogy. Welcome to some of the best Josselyn genealogy resources found on the web. We hope you will participate on the Josselyn forums, it is a great place to find or post information on Josselyn genealogy and is completely free to participate.