Cognomen Lajeunesse (Lajeunesse 
) , in the world, is quite a rare surname. The last name Lajeunesse is characteristic of Canada, where it is quite a rare surname, Mauritius, and New Zealand. Measured by absolute frequency, the name is most common in Canada, the United States, and France.
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| Lajeunesse | Mauritius, United States, Canada, France, New Zealand |
| joseph lajeunesse Canadian musician, organist, and harpist, CA (b. 1818) |
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| cornélia nelly lajeunesse Canadian pianist, teacher and contralto, GB (b. 1854) |
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| martin joseph-honoré lajeunesse Roman Catholic bishop (b. 1890) |
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claude lajeunesse Canadian academic administrator, CA (b. 1941) |
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marcel lajeunesse researcher, CA (b. 1942) |
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serge lajeunesse Canadian ice hockey player, CA (b. 1950) |
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| omer lajeunesse American football player and coach (b. 1908) |
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| madeleine lajeunesse FR (b. 1898) |
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| jean lajeunesse Canadian actor, CA (b. 1921) |
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| marcelle lajeunesse French actress, FR (b. 1924) |
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| raymond lucien lajeunesse IN (b. 1924) |
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| roberte lajeunesse French politician, FR (b. 1940) |
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| yvette lajeunesse (b. 1951) |
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| e. lajeunesse researcher ORCID ID = 0000-0002-0950-6054 |
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| todd c. lajeunesse researcher |
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