The Gigli surgical saw, that allowed faster, easier, and safer opening of the skull, originated with Leonardo Gigli (1863–1908), an Italian surgeon and obstetrician.
Ref: W. W. Keen, “On the Use of the Gigli Wire Saw to Obtain Access to the Brain,” The Philadelphia Medical Journal (Jan. 1, 1889): 323-33.
Dan Aurel Nica, et. al., “Leonardo Gigli and the Gigli Saw—Gigli Redividus,” World Neurosurgery 135 (March 2020): 35-37.