 The name " Zennor Head " originates from the name of a local saint , Senara . According to local legend , Senara was thrown off a headland in Brittany in a barrel after being falsely accused of adultery by her husband and washed up on the Cornish coast , founding Zennor and giving her name to the eponymous village ( and subsequently Zennor Head , Zennor Quoit and Porthzennor Cove ) , before continuing to Ireland . The " s " changed to a " z " , an occurrence common in the West Country but rare elsewhere , and as such is the largest coastal feature in the United Kingdom to begin with the letter " Z " . 
