1844 Baptism, Magherafelt Catholic parish

[oldohiohome]

The link I gave you states that Ballymaguigan was part of Magherafelt Parish until 1990s.
It is quite close.

I think this is the one, maybe the information at Irish Ancestors (johngrenham.com) is based on the modern parish boundaries. That says that Ballymaguigan is in Artrea and Desertlin Catholic Parish.

[oldohiohome]

On the first page of this baptism register, the townland is in the margin right after a baptism witnessed by a Mary Quin. It looks to me like the second half of the townland's name, the way the priest wrote it, starts with a Q. I will attach the image.
If so then I will settle for Ballymaquigan = Ballymaguigan.
Even if not,  at this point. 

[dublin1850]

The name 'as gaeilge' would have a 'c' sound at the end of Mhic.

If you look it up on logainm.ie you can see a c (q) sound was one of the early forms of Ballymaguigan.
https://www.logainm.ie/en/1413306?s=ballymaguigan
Click 'Open scanned records'.

[oldohiohome]

Thank you, that makes it definite.