Awesome cocktail, once you had it you won't ask for anything else!!
It's called Sunrise because of the way it looks, red/orange/yellow like the sky looks every morning when the sun comes up.
Also the name of a hawt movie that was released in 1988.
How to make a Tequila Sunrise:
1. Poor Tequila and Orange Juice in a longdrinkglass
2. Add 3 icecubes
3. Stir for a few seconds
4. Add a little bit of grenadine in the middle of the glass
5. Put a slice of lemon on the edge of the glass
And there you have it: TEQUILA SUNRISE!!!