You sure about that? Because Richard's family name was Plantagenet, not Lionheart or Lionhearted. "Lion-Heart" was only his nickname, similar to Peter The Great, or Erik The Red, or Pedro The Cruel, or Ivan The Terrible, or Edward Longshanks, or Louis The Fat, or Obama The Foolhead/Dunderhead/Doganhead etc etc. In addition, he never spoke English, so his nickname was "Couer de Lion" == Heart of the Lion. In later times, as the French language waned in England, it would be anglicized to "Lionheart." (And no, Ethelred was not "Unready". Just terminally stupid is all.)
It was a joke. I thought that much was obvious by the tone of the post.