The second 'H' is Harriet Jane McIlhagga who married in Belfast in the Oct-Dec quarter of 1909. This is a particularly interesting marriage, to William Robert Girvin, on 3rd November 1909, at Trinity Church of Ireland Belfast, for Harriet Jane was a widow. Her maiden name was McAughtrey. She had previously married Daniel McIlhagga on 12th April 1902 at Frederick Street Methodist Church. Simply on the evidence of date, it is possible that this Daniel was the son of John McIlhagga and Margaret Douglas of Templepatrick. He was born on 31st July 1880 so would have been 21 when he married Harriet Jane and would have died when he was 28.
The third 'H' is Henrietta McIlhagga who was born and died in 1870. The FamilySearch record gives us a death date of 6th August in County Antrim. This is certainly the Henrietta whose birth date was 15th February in Belfast. The additional information given is that she was a 'Merchant's child'. This merchant was Nathaniel Owens McIlhagga who was married to Henrietta Wilson. Baby Henrietta was their second child after William who had been born two years previously. Their third child, James Wilson, was born just twelve months after Henrietta.
There are three 'I' records, all related. The earliest is the death in Kimberley, British Columbia, Canada, on 26th September 1944 of Isabel Bates, nee McIlhagga. She was born on 10th April 1897 in Greenock Scotland, to James McIlhagga and Johanna McCulloch. She was we believe registered Isabella McFady McIlhagga. Her marriage to Hugh G. Bates is new information. The next record is the fact that they had a daughter, Isabel Gallagher, born 12th August 1921 at Gleichen, Alberta, Canada, who married John Duff Leith and who died aged 49 on 16th April 1971 at Trail, British Columbia. The third record is that Hugh Gallagher Bates was born on 21st December 1888 in Dublin, Ireland and died on the 26th September 1973 aged 84 at Kimberley, British Columbia. He was the son of Thomas and Isobel Bates. He had remained a widow for 29 years.