If by 'in Wales' you mean 'in Welsh' it's Nadolig Llawen. Almost all people in Wales speak English!
Nadolig Llawen means Merry Christmas in Welsh
Nadolig Llawen is Welsh and it means "Merry Christmas" in English.
Nadolig llawen
Nadolig llawen
'Nadolig Llawen' is how you say 'Merry Christmas' in Welsh
Merry Christmas in welsh!
Nadolig Llawen
Nadolig Llawen
Nadolig Llawen a Blwyddyn Newydd Dda. Nadolig = Christmas Llawen = Merry a = and Blwyddyn = Year Newydd = New Dda = Good
'Merry Christmas to you all'
Merry Christmas everyone ~ Nadolig Llawen pawb