This post is in relation to "Wraystown" only: The Surnames of Ireland by Dr. Edward MacLysaght:
WRAY - This is sometimes a synonym of Rea and MacRea, but usually it is the name of Elizabethan settlers in Ulster. The name is now mainly found in Counties Derry and Donegal.
It does not appear in Tithe Records - 1823 - 1837, nor Griffith's Valuation of Townlands compiled in 1840's and 50's.
Old Church of Ireland records may have a record of families in the particular area named "Wray" from whom it took its name.