Cognomen Toyonaga (Toyonaga 
) , in all the world, is a rare surname. The cognomen Toyonaga is characteristic of Brazil, where it is a very rare surname, Japan, and Canada. Measured by absolute frequency, it is commonest in Brazil, Japan, and Indonesia. More frequently, Toyonaga is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Toyonaga | Canada, Brazil, Japan, Indonesia, United States |
| takashi toyonaga researcher (ORCID 0000-0002-1798-2392) |
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| takuya toyonaga researcher |
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| haruka toyonaga researcher (ORCID 0000-0001-7300-3665) |
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| yosuke toyonaga researcher |
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| takahiko toyonaga researcher (ORCID 0000-0003-4027-2708) |
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| takashi toyonaga researcher ORCID 0000-0003-1226-6749 |
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