How do you say thank in Welsh?

There are a few ways to say "thank you" in Welsh, depending on the context and level of formality:

Formal:

* Diolch yn fawr (dee-olch un vour) - This is the most common and polite way to say thank you. It literally translates to "thank you very much."

Informal:

* Diolch (dee-olch) - This is a more casual way to say thank you.

* Diolch yn fawr iawn (dee-olch un vour ee-awn) - This is a more emphatic way to say thank you, meaning "thank you very much indeed."

Other options:

* Diolch yn fawr am hynny (dee-olch un vour am hin-nee) - This means "thank you very much for that."

* Diolch i chi (dee-olch ee kee) - This means "thank you to you" and is a more formal way to say thank you.

Note: Welsh is a language with a lot of intonation and stress, so it's important to try and get the pronunciation as close to native speakers as possible.