It is? Lyanna/Rhaegar, Dany/Drogo, Jaime/Cersei, and especially Sansa/Sandor are the more popular ones I've seen. I'm kind of surprised there were even fanarts of Jon/Dany. So far I've only found 2 tho. This one and one manip wallpaper.
Barely there following doesn't really amount to that big of a popularity. D: idk why when someone states their support for this pairing, someone else has to point out how weird/not-canon/how unlikely/whatever else it is and just let them ship in peace. /kanyeshrug