What is "tomonaga"

Tomonaga is a Japanese surname. Notable people with the surname include:

• Jacobo Kyushei Tomonaga (1582–1633), Japanese priest in the Dominican Order of the Catholic Church
• Minamoto no Tomonaga (1144–1160), Minamoto clan samurai of the late Heian period
• Natsumi Tomonaga (born 1991), Japanese modern pentathlete
• Sin-Itiro Tomonaga (1906–1979), Japanese physicist and Nobel Prize winner, influential in the development of quantum electrodynamics