When we read Jack the Giant Killer out loud to our son Zachary, we had to replace all "Jack" with "Zach". It was really hard to get every one, but he corrected us if we accidentally said "Jack".

Elizabeth Moon's The Death of Sleep series had giants; not sure if in the first book, Planet Pirates.

Ella Enchanted by Gail Carson Levine has giants. (It is also a movie.)

Harry Potter mentions giants, but I wouldn't really count that one.

Didn't Lord of the Rings have giants?