A Primary Source. This birth register is a primary genealogy source for finding the location and relative number of Irish families in 19th century Ireland. (Most families remain centered in the same areas in Ireland).This is an enlarged print out of the birth index of Ireland. It lists every surname found, and the county it was found in. Larger print makes it easier to read than the original.  We have added a map of the counties and provinces along with commentary. Research aid published by the Irish Genealogical Foundation. One of the very few sources we have to locate surnames for the genealogy researcher in 19th century Ireland. This work serves as an Irish census records substitute for locating traditional family names in Ireland. If you do not know where to start looking for death, marriage and land records, this family surname locator could help find your county of origin.