from The American Heritage® Dictionary of the English Language, 4th Edition
- An island group of Japan in the southern Ryuku Islands east of Taiwan. The islands were heavily bombed by the Allies in April-June 1945.
Sorry, no etymologies found.
The Japanese archipelago comprises 4 main islands and 200 smaller islands, including those of the Amami, Okinawa, and Sakishima chains of the Ryukyu Islands.
 The name Saka is found in Japan, even on modern maps: Sakai (near Osaka), Saeki, Sakaiminato, Sakata, Sakishima, and Sakurai.