(This was in mid-writtenness when we lost power...)

It's considered a variant of Rapunzel, but I shall check around and see if I can find -- 30 seconds later - interesting! On Sur La Lune it says that traditionally he's just 'the prince', but many modern variants have given him a name. And - I'd completely forgotten, it says there that 'Rapunzel' is another name for 'rampion', which is the herb her pregnant mother says she must have to eat or she'll die.