About Welsh letters
Welsh uses the circumflex (to bach) on all seven vowels including w and y, and occasionally the acute, grave and diaeresis.
The UK Extended layout on Windows types ŵ and ŷ with Alt Gr+6 then the letter; on a Mac, Option+I then W or Y works on the British layout.
ŵ and ŷ have no Alt codes; in Word type 0175 or 0177 then Alt+X.
Welsh letters: names and codes
Every special letter in Welsh, with the Windows Alt code where one exists, the hex code to type in Word followed by Alt+X, the Mac shortcut and the HTML entity. Click a letter to copy it.