Merfyn is a Welsh given name, typically pronounced /ˈmɛrvɪn/. The first syllable "Mer" is pronounced as "Meh-r", with the 'e' being a short vowel sound. The second syllable "fyn" is pronounced as "vin" with the 'y' representing the 'uh' sound. The spelling of the name comes from the Welsh language, which uses a different phonetic system than English. If you're unsure how to pronounce Welsh names correctly, it's always a good idea to look up the IPA phonetic transcription.
The name Merfyn is of Welsh origin. It comes from the Old Welsh name Mervyn, which is derived from the elements mer meaning marrow or fame and wyn meaning fair or blessed. Thus, the name Merfyn can be interpreted as famous marrow or blessed one.