The connections between JUPIN, DZUPIN, and DSUPIN families are liable to be as close as those between the JUPINAs and DZ(S)UPINAs. All these families seem to have originated in the Slovak area of wehat used to be the Austro-Hungarian empire between 1880 and 1925. It is my personal belief that the families may all have a common origin some time in the late 18th century.
A number of individuals have now worked together to establish a restricted access (password protected) JUPINA-JUPENA-DZUPINA genealogy web site. This site already contains information on many members of these families, who clearly can all trace their origins back to a limited area of what is now the southeastern area of the Slovak Republic. Anyone who is interested in learning more is very welcome to contact me.