It goes to Greek alphabet after we get to Wilma.
In 1933, there were 21 tropical storms/hurricanes, no storms were named back then. In 1995, the last storm named was Hurricane Tanya.
We've never gone all the way through the alphabet. 1995 was the record year for named storms, and that year it went to the "T" storm. If the season runs out of the alphabet, the storm names then start over using the greek alphabet letters as storm names.