Yes, there’s a St. Gandalf. In fact, there’s more than one! Hahahahah! Man, it’s a good thing I didn’t know this when I was a kid picking Confirmation names.
St. Gondulphus of Metz (bishop, died in 923, feastday Sept. 6), St. Gondulphus of Tongres (aka Gondulphus of Maastricht, bishop in the 6th century, feastday July 16), and St. Gondulphus of Berry (bishop or holy man, feastday June 17).
So yes, two days from now is:
SAINT GANDALF’S DAY!