Not sure why you've posted on the Isle of Man genealogy board.

There was a DeMeza family on Isle of Man in the mid-1800's. The info is probably in the archives of this board which I never can work. The family originated in Portugal and entered into the paper making business. As they moved to different countries they left family there and some moved elsewhere.
The family who came to IOM originated in Manchester, England. William DeMeza was b 1845, in 1864 he married Margaret Ann Kelly b 1847 IOM.
William had siblings-- Elizabeth - 1824, John-1828, Rachel- 1833, George-1835, Ann-1837, Louisa-1842, of these the first four born in Manchester and the last two in IOM. Their father was William b 1801
William & Margaret had George H. DeMeza - 1878 - USA--ancestor of person who put this info on the board.
his siblings= Louisa-1864-IOM, Elizabeth-1867-Manchester, Margaret-1864-USA

Perhaps you can make contact with the person who posted this info.

I found some DeMeza info on internet www .edpopehistory.co.uk /entries/demeza-william /1000-01-01-000000 CLOSE THE SPACES
Demeza, William
Submitted by edpope on Tue, 12/09/2014 - 18:31

SOCIETY FOR CONSTITUTIONAL INFORMATION; William Demeza of Whitechapel proposed 14.3.1783 by John Satchell 2nded Edward Hall
Though the name was Portuguese Jewish this family must have gone native / Solomon Demeza = St James Clerkenwell 1.9.1734 Ann Hale botp banns / Isaac bapt Stepney 1737 of Solomon & Ann / will PCC 1771 of Solomon Demeza dated 16.6.1769 mentioned wife Ann sons William Hale & Isaac / William Hale Demeza = Bromley, Kent 31.12.1772 Susannah Ellis / their children bapt Whitechapel William 1773, John 1776, Sarah 1781, Richard 1782 (bur 1783 Bromley), George Ellis 1784, Mary Ann 1787 / will PCC 1775 of Isaac Demeza of Bromley sworn to 12.7.1775 by his brother William Demeza of Lambeth St, Goodmans Fields, Whitechapel papermaker / SunFire 1778-9 William Demeza paper & flock manufacturer 32 Leman St, Goodmans Fields, 1781 stationer & rag merchant 75 Whitechapel / directories 1783-1787 stationer 75 Whiechapel / 1785 governor of Kent Dispensary, Deptford / 1788 subscr to Alexander Bicknell's Patriot King / bankrupt 26.5.1788 sale of stock 2.7.1788 & 22.7.1788 / William Hale Demeza buried 7.8.1788 Bromley / his wife and children may have moved to Manchester area - Mary Ann Demeza age 12 bur Congleton, Cheshire 1799 / Elizabeth Demeza sp removal order to St Marylebone from Liverpool 1801 / Manchester Times 7.2.1849 William Demeza stationer Salford married Ann Moores in the Hope Chapel / Lancaster Gazette 2.7.1853 Wm Demeza of John & Wm Demeza paper makers of Castle Mills, Farnworth accused of uttering forged bills / Liverpool Mercury 23.8.1853 two months imprisonment and ten years' transportation / Liverpool Mercury 15.11.1862 marriage of dau of late W.H. Demeza paper manufacturer / Glasgow Herald 21.1.1868 ad for Wm Demeza paper maker Manchester

Donna
Gig Harbor WA