Kirrlach is in the north of Baden-Wuerttemberg. You can type it into "mapquest.com" for Germany and it will show up. Did your g-g-parents marry there or in the States? One option to find more about them is to order the microfilms available at the Family History Centres of the Church of Latter Day Saints. If their internet site is correct (www.familysearch.org
they should have the church records of Kirrlach from before 1888.
Hope this helps,