How do you say hello in penrhyn?

There is no language called "Penrhyn." It's possible you're thinking of:

* Penryn: This is a town in Cornwall, England. The language spoken there is Cornish, and "hello" is "dydh da" (pronounced "dee-da").

* Penrhyn, Wales: This is a location in Wales. The language spoken there is Welsh, and "hello" is "helo" (pronounced "heh-loh").

Please clarify which place you're referring to, and I can give you the correct greeting!