You would be referring to a yacht...?
Whatever people fancy: my friend has a boat and they called it Dreamtime.I once saw one named "Lucky Me".
A Yacht is a fancy boat.
Boo - 2003 Fishing Boat Fancy Dress was released on: USA: 26 July 2007
there is a game called fancy pants
A harbour boat is of course called a harbour boat.
the boat is called a waka
Because they are elegant pets
No, the back of a boat is called stern, bow is a front of a boat.
Back of a boat is called stern and Bow is the front of a boat.
Blue diamonds are called fancy colored diamonds, and there are several names for the shades of blue, including, from Wikipedia: "Faint, Very Light, Light, Fancy Light, Fancy, Fancy Dark, Fancy Intense, Fancy Deep, Fancy Vivid." Also from Wikipedia, there are 27 different names for colour hues that include bluish colors. You can read more, below.
Yes, "fancy" can be used as a noun to refer to a liking or preference for something or someone. For example, "He had a fancy for expensive cars."