The following are some of the many Klingon House or Family Line Registries in fandom.

Klingon Line Families Heraldry
c/o Andrea Benton (Sajqa)
< [email protected] >
www.geocities.com/sajqa/
http://groups.yahoo.com/group/KlingonLineFamilies/

Klingon Archivers Guild
c/o Kilmarac of House Jarov
< [email protected] >
http://www.klingonempire.net/archivers

Independent Klingon Line Registry
c/o Lt. Kmdr. Karn Heck'Lher
< [email protected] >
http://iklr.home.attbi.com/

K'Tak's Line Registry
http://www.geocities.com/kaghouselinereg/listings.html