Surname Tomonaga (Tomonaga 
) , across the world, is a rare family name. The family name Tomonaga is characteristic of Hong Kong, where it is a rare surname, Austria, and Czechia. In absolute terms, it is the most numerous in Japan, Brazil, and the United States. More frequently, Tomonaga is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Tomonaga | Japan, China, Brazil, Hong Kong, United States |
Shin'Ichiro, and トモナガ
| kenzō tomonaga (b. 1944) |
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| shozo tomonaga researcher |
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| kyoko tomonaga Japanese ex-female idol |
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| taisuke tomonaga researcher |
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| keizo tomonaga researcher |
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| keizo tomonaga |
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