There are 2 Hagan's listed in the current telephone book for Westmeath, also 2 Haggan's 1 Ramelton, Mountcharies and 1 Donegal. 6 Haggins but none in Westmeath, Dublin and other counties. 4 Kerry but none in Westmeath.
There are 30's Ray's listed in Westmeath, however, only 1 where it is a surname. 1 McDaniel, Kilbeggan;
17 OHara's, 1 in *Granard;
Closest name to Caragain, Carragan, Carrghan, Carrega?
Rathowen was a townland in the Parish of Rathaspick & Russagh, Poor Law Union *Granard (within 12 mi)
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Griffith Valuation Westmeath 1854 used as a census substitute. www.askaboutireland.ie
Tithe Applotments, census substitute 1823-1837www.genealogy.nationalarchives.ie