Cognomen Defay (Defay 
) , globally, is quite a rare surname. The surname Defay is habitual in France, where it is quite a rare surname, Belgium, where it is a rare surname, and the United States, where it is a very rare surname.
| emile defay Belgian industrialist, BE (b. 1891) |
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| raymond defay born:1897-02-01|died:1987-07-05|; Defay, Raymond; Defay, Raymond, 1897-1987; Defay, R. 1897-; Defay, R. (Raymond), 1897-; Defay, Raymond 1897-1990, BE (b. 1897) |
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johanne defay French surfer, FR (b. 1993) |
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| anne-marie defay French politician (1949-2016), FR (b. 1949) |
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| martine defay French politician, FR (b. 1954) |
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| pierre-olivier defay French particle physicist |
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| emmanuel defay researcher |
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