See alsoThomas Maxwell , John Maxwell and Nugent Maxwel - may be brothers or other relation of this David Maxwell. All lived in same Townland and had children baptised in same parish around the same time.
Sources
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"Ireland, Valuation Office Books, 1831-1856," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVMG-TF99 : 15 March 2018), David Maxwell, 1839; from “Griffith's Valuation 1847-1864,” database and images, findmypast (http://www.findmypast.com : 2014); citing Derryvullan, County Fermanagh, Ireland, Field Books, various libraries, offices, and a private collection.