Surname Franssu (Franssu 
) , all over the world, is a rare last name. The cognomen Franssu is characteristic of Western Europe, particularly Luxembourg, where it is quite a rare surname, France, where it is a rare surname, and Belgium.
| VARIANT | COUNTRY |
|---|---|
| Franssu | Germany, China, Belgium, France, Luxembourg |
| jean-baptiste de franssu French economist, FR (b. 1963) |
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| gérard mialet de franssu FR (b. 1958) |
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