Usually I call him Link. I can't use my real name because I'm a girl and it's not really a unisex name.

It would be way weird for me if I used my real name.
If I don't put Link, I usually put something super ridiculous for the luls or name him after a character I like in something else. I named him Anakin once in a Twilight Princess play through. Haha. That being said, I also named Epona 'ur shoe' that time, so it was clearly not a serious play through.
Like I said though, most of the time I name him Link. If I don't name him Link, it feels kind of odd for me. I usually have one permanent file that I get everything on and then never delete it so I can see if I can find anymore secrets later on. Basically, a 100% file. If it's not named Link, it gets on my nerves after awhile and I end up having to make a new permanent file. I figure always calling him Link will save me the trouble.