There has been extensive research on the name. The last "Swanzy family lived at Avelreagh House, Avelreah townland, in the parish of Clontibret, Co. Monaghan. Search on Henry Biddell Swanzy at the PRONI website.. http://proni.nics.gov.uk/records/USING/using.htm#index under prominent persons.. Main page.... http://proni.nics.gov.uk/ HTH. Ann