Worldwide, Guillaume-Antoine (Guillaume-Antoine 
) is an extremely rare boy's given name. Parts of the name also exists independently as a first name Guillaume, and a first name Antoine.
| VARIANT | COUNTRY |
|---|---|
| Guillaume-Antoine | Canada, France |
|
guillaume-antoine delfaud French Jesuit, FR (b. 1733) |
|
| guillaume-antoine calvière French musician, FR (b. 1695) |
|
|
|
guillaume-antoine sery French politician, FR (b. 1751) |
|
|
guillaume-antoine olivier French entomologist and botanist (1756–1814), FR (b. 1756) |
|
| guillaume-antoine deluc Genevan paleontologist (1729-1812), CH (b. 1729) |
|
|
| guillaume-antoine maréchal academic, member of the Accademia delle Scienze di Torino since 1813 |
|