* Croeso: This is the most common and general way to say "welcome". It can be used in any situation.
* Croeso cynnes: This means "warm welcome" and is used to express a more heartfelt greeting.
* Croeso i chi: This literally means "welcome to you" and is used to welcome a specific person.
* Croeso i Gymru: This means "welcome to Wales" and is used to welcome someone to the country.
You can also use the phrase "Mae'n bleser gen i eich croesawu" which means "It's a pleasure to welcome you". This is a more formal way of saying "welcome".