A birthday cake in French is 'un gâteau d'anniversaire'
you have a birthday cake
"la grand-mère sert le gâteau d'anniversaire"
Gateau is food cake in french
Canadians (for the most part speak English) so a birthday cake would be called a birthday cake. However, for the francophones (french speakers) in Canada a birthday cake would be called: gâteau d'anniversaire
gâteau
A banana cake is "un gâteau à la banane" in French.
a birthday is 'un anniversaire' in French
Birthday is "anniversaire" (masc.) in French.
gâteau sucré
In French, you would say, "Puis-je avoir un gâteau, s'il vous plaît ?" This phrase translates directly to "Can I have a cake, please?" in English. It’s a polite way to request a cake in French-speaking contexts.
In Hawaiian, "birthday cake" is translated as "kekona lā hānau." The term "kekona" refers to cake, while "lā hānau" means birthday. This phrase is commonly used when celebrating birthdays in Hawaiian culture.
If you mean a slice of cake it is - tranche