I don't know of any resource that lists the various religious affiliations of all persons bearing the surname Hahn. It is possible to deduce something about the relious affiliations of some Hahn families. It would appear that the family name Hahn is derived from the name of the town of Hahn in the Rhineland-Palatine region of Western Germany. In modern Germany, about thirty-one-percent of the population describe themselves as Catholic, about thirty-two percent are Protestant, about thirty percent claim no religious affiliation, and the remainder are Orthodox, Muslim, Jewish, Hindu, or other. More likely than not, then, if you meet a member of a Hahn family, there's an about even chance that he or she will be Catholic, Protestant, or unaffiliated.
Joe Hahn, a member of the band Linkin Park, has not publicly disclosed his religious beliefs or affiliations.
Ed Hahn's birth name is William Edgar Hahn.
Gunnar Hahn's birth name is Gunnar Arvid Hahn.
Jess Hahn's birth name is Jesse Beryle Hahn.
Scott Hahn's birth name is Scott Austin Hahn.
Horace Hahn's birth name is Horace L. Hahn.
Edith Hahn Beer's birth name is Edith Hahn.
It is Nooldes Hahn
Gisela Hahn's birth name is Gisela Drenkhan.
Jasmin Hahn's birth name is Yasmin Ait-Jidar.
Eliska Hahn's birth name is Eliska Dawn Prince.
Thich Nhat Hahn's birth name is Nht, Hanh.