Joanne_ My research for the past 30 years points to the very same conclusion_ that my GGGGG (5X) grandfather William Alexander McElravy was married to Bridgette Elizabeth O'Toolan.
I have copied pages from my GGG grandmother's 1856 bible in which she recorded her family's records; births and deaths.She was the wife of John McElravy b. April 17, 1800 who is the older brother of your Cornelius McElravy b. January 20, 1805.This Cornelius is the father of Charles Wesley.
John's wife was Catherine Shannon, daughter of Daniel Shannon of Nothumberland County, PA.Her father ran a mercantile in the early days of western PA settlement.The area in which they lived would later be named Shannondale.Her younger brother Christopher took over the family business and is well documented in early records of that area as well.
John and Catharine were documented with their 7 children in Centre County, Ferguson Twp. in 1840, later moving to Clarion County, Beaver Twp.John and his father Benjamin (most likely some of John's brothers too) and his grandfather were entitled to 200 acres of scripted land for their participation as part of the Militia in the Revolutionary War.They fulfilled their service in the Cumberland Territory which is now part of Delaware, Maryland and Pennsylvania.
John's grandfather William Alexander McElravy was born in what was known as the Cumberland Territory of PA and as an adult lived in what was then Huntingdon County, Barre Twp. with quite a large household, incorporating no less than 2 other immediate branches of the McElravy Clan, including married sons with children, possibly even a few cousins who would later remove to Allegheny, Washington and Greene Counties in PA.William Alexander's oldest son Benjamin (my John's father, your Cornelius' brother) lived just a mile or so across the county and township lines during the early 1800's.
After 1840 John, Catharine and their 7 children moved from the area and settled in Clarion County, Beaver Twp; they are documented there in the 1850 Census.John died on November 20, 1856 and soon after Catharine and her youngest daughter Margaret moved to Armstrong County and lived next door to her son David. She is documented there in the 1860 Census.She is documented living in David's household in the 1880 Census records.Catharine died February 8, 1881 at the home of her son David in Duncansville, Madison Twp., Armstrong County, PA.
In February of 1856 Catharine received a large family bible for her birthday and penned all of her family's pertinent dates within.The bible passed to David's wife Anna and then to David's daughter Annie Elizabeth.Possesion then went to Ethel's daughter Bonnel.
The bible pages are more accurate than Census records for their individual dates.Amazingly, in the copies I have, Catherine's fingerprints are clearly seen on the edges of the pages altho they are not visible on the originalbible.The family information was written with a quill pen and is done with quite a flourish of style in the handwriting of those days_ it's almost artwork.
Hope some of this information clarifies a few things for your branch.