I don't speak Welsh but I think it's: Diolch i chi fy ffrind.
You can check it with free translation services on the Web.
"Thank you" in Welsh is "diolch."
The Welsh word for friend is ffrind.The Welsh word for best friend is ffrind gorau.ANOTHER ANSWER:fy ffrind or fy nghyfaill. (my friend).
Diolch i ti ffrind
ddiolch 'ch' m chyfaill
Diolch am bobeth!
You can say "diolch yn fawr iawn" in Welsh to express "thank you very much".
Welsh has a informal usage and a more formal usage:Da iawn, diolch. (informal)Da iawn, diolch. (formal)
You can say "Thank you for accepting me as your friend" in English.
cyfaill
Thank you = Obrigado
In Comanche, you can say "Thank you, tʉn nʉmʉnʉ."
Ffrind gorau