"Excuse me, William."

Translation: Gabh mo leisgeul, Uilleim.

[BhauliyaMoss]

Sometimes uilleim is spelt with an a instead of the i before the m. Is that correct and why? I think I missed something..

[silmeth]

Uilleam is the nominative (default) form of the name, Uilleim is the vocative (addressing) form. It is explained in the tips and notes to the Names skill.

[FiferWD]

I always get the two mixed up.
And my front name is William!