missmoneypenny
I see nothing special about Sarah's location. All the lockeepers residing in Brackagh Townland, near Portadown, would have lived at the house located beside what is now referred to as Moneypenny's Lock due to the fact they did live there for >85 years.
The canal runs between Newry & Portadown but Newry is basically irrelevent to both Brackagh and Maguiresbridge. If you were travelling from Newry you would go via Armagh City or through Monaghan Town.
One family historian suggested that Mary Jane was from Maguiresbridge, but William was not because there were no records of Moneypennys in that area at that time
As no marriage registers survive for the period before 1800 for Maguiresbridge and Aghalurcher parish for any denomination and no baptisms before 1788, and none are online, establishing if Moneypennys are recorded could only be inferred by reading the subsequent microfilm in PRONI. I do agree that subsequently there is only the one civil entry I mentioned and the surname is prevalent in Armagh. Freeholder and Name search on PRONI for the 1st half of the 1800s period also show all Moneypennys from Armagh.
I'm not sure what you would look at on a further research trip. Any marriage entries c.1790 will be minimal, listing just the names of the parties, no parents, they may say of Brackagh or they may say of Kilmore or may be just names & date so if a register existed is unlikely to lead to a breakthrough. I feel you need to discount Maguiresbridge or discount Stephen.
William was born in 1781 in Maguiresbridge and married Mary Jane Kenney (in Maguiresbridge) before they both immigrated to the States, arriving in 1798
Whilst the legal age for marriage was 12 for woman and 14 for men such young marriages were pratically unheard of. If it had been common there would have been public pressure to raise the legal minimum age of marriage earlier than 1929. The average age was 25 even in the 17th Century. In the late 1840s GROI reports indicate only 5% of males married under 21 (full age; the vast majority of those being 19-20).
https://archive.org/details/op1247297-1001/page/n3/mode/2up. Mid 1880's in England GRO reports show less than 1 in 1000 males married under 18.
I suspect you are putting too much faith in ages recorded in subsequent records, people tended to underestimate their ages on census and informants on parent's deaths. I would suggest that William was more likely baptised/born in the 1770's if a register existed / entry was found.
On 1810 naturalization petition William says he arrived 1794-5. There are hundreds of trees with William Moneypenny. One of the typed documents does mention a John Moneypenny from Enniskillen, Fermanagh.
https://www.ancestry.co.uk/family-tree/person/tree/81659093/person/36473029027/gallery?galleryPage=1https://www.ancestry.co.uk/family-tree/person/tree/1653487/person/-1905779445/gallery?galleryPage=1Many of the 415 trees
https://www.ancestry.co.uk/search/collections/1030/?name=william_moneypenny&count=50&keyword=fermanagh&keyword_x=1&name_x=1 show William's father as Stephen and mother as Mary Jane Nesbitt. That is a distortion of the relationships from Familysearch from a marriage after Stephen's death 1837, aged 87, as clearer when you consult the actual 1848 certificate on
https://civilrecords.irishgenealogy.ie/churchrecords/images/marriage_returns/marriages_1848/09342/5382728.pdf which is for a (Farmer, not a lockeeper of Shanecrackan, Mullaghbrack).
That error has been copied and perpetuated.
https://www.ancestry.com/family-tree/person/tree/13073776/person/-125379972//factsBarring that there no evidence I see that your William's father was 'Stephen'.
"Notes on the Irish Origin of the Moneypenny & Kenny Families of West Virginia, by David Armstrong"
https://h3scpd.wildapricot.org/resources/HCPD%20Publications/HCPD%20Journals/21-Issue%201.pdfTheir 1st known son James is thought to have been born 1797 in the US.
The older research & Ancestry trees suggests they may both have been born c.1765 see images on
and
https://www.geni.com/people/William-Moneypenny/6000000069302123115https://www.familysearch.org/tree/person/details/LCP2-9JGhttps://www.genealogy.com/ftm/m/o/n/Chuck--Moneypenny/GENE1-0001.htmlAs lockeeper Stephen was born c.1750 based on the Belfast Newsletter death entry he is also too young to be father of a William born 1765-70.
https://www.ancestry.com/discoveryui-content/view/49425:2193https://www.genuki.org.uk/big/irl/FER/Aghalurcher