Rabbi Isaiah Lazer Isserles - Additional Source

Jacobi Papers: Volume 2, p. 427, 14.7: "R. Jeschaya (b. (?) Mosche III Isserles)..."; Volume 2, p. 426, 15.2: "R. Moshe III (b) Elieser-Laser I-Schrentzel Isserles..." The question mark on the former indicates a doubt regarding the information. The sources used by Jacobi for the former record are: S.Z. Kahan, ענף עץ אבות (Cracow 1903): XVII (No. 124), p. 16 (No. 56 and n. 56) and XI (No. 56); J.L. Shapiro, Ancient Jewish Families, (Hebr.: Tel Aviv 1951): 64.