While the name itself says cake, there's lingering debate about whether or not a cheesecake is indeed a cake.
Some people argue the dessert's crust clearly distinguishes it from a cake, making it a pie.
The argument continues with the 'cheese' in cheesecake. There's no flour or icing, just a custard filling that makes it no different from a Boston Creme Pie.
However, the case is still strong on the cake side with a definition from Dictionay.com that calls the dessert a cake.
The truth is, just like the hot dog as sandwich debate, the world may never know the answer to this question.