Yes, there is another letter leads to a lot of pronunciation mistakes. It is the letter G. G can be pronounced two different ways.
The letter G can be pronounced as:
J in GEM
G in GOOD
How can you tell which pronunciation to use? Just follow these rules:
If the letter G comes before I, E, or Y, then pronounce the letter G as a J sound.
If the letter G comes before A, O, or U, then pronounce the letter G as a G sound.