Here's how to pronounce it:
* Pen-blwydd:
* Pen: Pronounced like "pen" in English, but with a slightly softer "n" sound.
* Blwydd: Pronounced like "bluth" with a short "u" sound, similar to the "u" in "but."
* Hapus:
* Hap: Pronounced like "hap" in English.
* Us: Pronounced like the "us" in "bus."
Putting it together: It sounds like "pen-bluth ha-pus."
It's helpful to listen to a native Welsh speaker pronounce it to get the correct intonation and rhythm. You can find audio pronunciations online or on language learning apps.