In NW Wales: Sut dach chi? (si-da-KHEE)
In S Wales: Shwd ych chi? (shu-di-KHEE/shu-DEE-khee)
Iaith- language.
You spell on in Welsh as ar.
chwi, 'ch; chwychwi; chwithau
lingua. pronounced: LEEN-gwah
The word is spelt as you have done in the question.