Worldwide, St Didier (St Didier 
) is a rare boy's first name. The first name St Didier is habitual in Sub-Saharan Africa, particularly the Democratic Republic of the Congo, where it is a rare male name. Much less frequently, St Didier is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| St Didier | France, Democratic Republic of the Congo |