Drew

Drew is not a short form of Andrew. If anything, Andrew is an Anglo-Germanic accomodation of the Hebrew of the Greek name Andres. Drew itself is an old Germanic and/or Celtic name meaning wise or manly, depending on what origin you read. When the name Andres entered into Germanic-Celtic realms (probably with the church) Andrew became an Anglicised version of Andres, thus proving the primacy of the original root name Drew in northern and western Europe.