What is the Welsh for Have a good day?

The most common and natural way to say "Have a good day" in Welsh is:

Cael di ddiwrnod da!

This literally translates to "Have you a good day!"

Here are some other options, depending on the context:

* Dymunaf ddiwrnod da i ti. (I wish a good day to you.)

* Gobeithio y bydd gen ti ddiwrnod da. (Hope you have a good day.)

* Cawsi di ddiwrnod braf. (Have a nice day.)

It's worth noting that Welsh grammar can be quite different from English, so the direct translation "Have a good day" wouldn't sound natural in Welsh.