How say hello in Welsh?

There are a few ways to say "hello" in Welsh, depending on the context:

Formal:

* Helo: This is the most common and straightforward way to say hello.

* Sut mae? (pronounced "soot my") - This means "How are you?" and is a polite way to greet someone.

Informal:

* Shwmae! (pronounced "shway") - This is a common informal greeting, similar to "Hiya" in English. It's often used among friends and family.

* Bore da! (pronounced "bore dah") - This means "Good morning" and is used in the morning.

* Prynhawn da! (pronounced "prun hawnd dah") - This means "Good afternoon" and is used in the afternoon.

* Nos da! (pronounced "nos dah") - This means "Good evening" and is used in the evening.

You can also combine these greetings with "Helo" to be even more polite, such as "Helo, shwmae!" or "Helo, sut mae?"