What a coinky-dink. My friend just bought a supposed Haflinger last week at an auction. I haven't seen him yet, but he is quite tall.
This guy here definitely looks Haflinger to me. Good and stocky, right colour, right height and right temperament.
Somehow "Happy" as in "Happy-go-lucky" stuck to me when I read about him. I'm not one for "-y" names though, so I would go for "Hap".