Dubin, David M. MD
The Shach’s ancestry has been worked out brilliantly by Rabbi Rakov of London using a comment in a published letter and its connection to the Frankfurt am Main records recorded in Ettlinger’s Ele Toldot.
The Shach’s mother was daughter of Nochum LOKWER (source unclear)
Gela was dtr of Majer (d 1559 son of Moshe BINGEN)
Rabbi Moshe was son of Rajtse (d1574, dtr of Jakob) and Gompel (d 1560). There’s more. Go to Ele Toldot available at the Leo Baeck institute website.