Of disputed origin. It has been in use since the 17th century. It is now generally taken as a feminine equivalent of Andreas, and this probably represents its actual origin. However, it was not in use in the Middle Ages, and the suggestion has also been made that it represents a coinage in English from the Greek vocabulary word andreia ‘manliness, virility’.
English: perhaps a deliberate alteration of Leatherhead, a habitational name from Leatherhead in Surrey, which is named from Celtic lēd ‘gray’ + rïd ‘ford’, or alternatively a habitational name from Lythwood in Shropshire, which is named from Old English hlið ‘slope’ + wudu ‘wood’.