Why are all the heroes in the legend of zelda named link?

Answer 1

The heroes are named Link in reference to other heroes going by the same name or past heroes that had gone by the same name. The "Hero of Time" from Ocarina of Time is the most referenced hero as he was the greatest hero saving Hyrule from the devastating power of Ganondorf. It's also a way to link themselves with said heroes and keeping the tradition alive of clothing boys in heroic clothes and allowing them to wield weapons and quite possibly save the world just like heroes before them.