Written by Rex Kissack - the Rev. Kissack (a well known Methodist minister) died some 2 or 3 years ago - there are known inaccuracies in he book - Rex said that he didnt intend to have it reprinted as he had no time to correct it! - copies are now relatively scarce it seems.
The Seed of Issac Rev R. Kissack Douglas: [1985]
'A one name publication' - it covers the whole of the Kissack sept from known records on the Island. Now out of print.
The MacIsaacs : possible origins of a Scots-Manx surname 1991 Douglas priv pub Author
The later book discusses the probable 14C Scottish base for the name (+ some corrections to earlier book).