How do you say are Welsh?

You can say "I am Welsh" or "I'm Welsh" to indicate that you are from Wales.

Here are some other ways to express this:

* I'm a Welshman/Welshwoman. (This is more formal and emphasizes your nationality)

* I'm of Welsh descent. (This implies that you may not have been born in Wales but have Welsh ancestry)

* My heritage is Welsh. (Similar to the above, emphasizing your ancestry)