Surname Billoir (Billoir 
) , around the globe, is a rare family name. The cognomen Billoir is characteristic of France, where it is quite a rare surname, Argentina, where it is an extremely rare surname, and the United States. Much less frequently, Billoir is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Billoir | Colombia, Argentina, France, United States |
| pierre billoir particle physicist at LPNHE, Paris |
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| frédérique billoir researcher |
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| paul billoir researcher (ORCID 0000-0001-5632-7713) |
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| elise billoir researcher (b. 1983) |
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| thibault billoir (b. 1987) |
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