It can be pronounced in two ways:
1. With a long "u" sound: "UL-lin"
* This pronunciation is more common in English-speaking contexts, particularly in names like "Ullin's Isle," which is a popular Irish ballad.
2. With a short "u" sound: "UH-lin"
* This pronunciation is more common in Irish Gaelic, where it is a male given name.
Without any further context, it's safer to assume the "UL-lin" pronunciation.