Most surnames that have an obvious meaning, will in fact have that obvious meaning.
French is an English word, meaning 'person from France'. So a common origin for the surname French would be from a French family living in an English-speaking region.
Many Huguenots fled to London between the Sixteenth and Eighteenth Centuries, fleeing French religious persecution: French is a common name among their descendents.
Like any other surname, the obvious answer isn't always the correct one. You need to research your family history to be sure (when was the surname first adopted? is this the original surname?).
But the obvious origin is the place to start.
The surname Tanguay is of French origin. It is a common surname in French-speaking regions, particularly in France and Quebec, Canada.
The nationality of the surname Yap is either Singaporean or Malaysian.
The last name Bertrand is commonly of French origin. It is a surname that can be found in France and other French-speaking countries.
The surname Aguet is of Swiss origin.
The surname Loynd is of English origin.
French
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French.
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French
French
The surname Darcy is of Irish or French origin. It can be found in both countries, so the nationality associated with the surname Darcy could be either Irish or French.
It is a corruption of the French surname Bauden.
It can be either Irish or French.
French