ViVa, found on the website for the International Institute for Social History , is "a current bibliography of women's and gender history in historical and women's studies journals." This index covers 1975 to the present year and currently has over 12,000 records. While this isn't an index to find your individual ancestor's name it can help you find some social history to better understand their lives.
For a list of journals indexed on ViVa click here. You can search this database by keyword or browse by year. There is also an advanced search feature.