Eddowes used the alias 'Mary Ann Kelly.'

Census 1871
John Tagert              Head          M       34     Ireland
Mary Tagert            Wife            F        33     Ireland
James Tagert           Son             M       14     Ireland
Catherine Tagert     Daughter     F        12     Ireland
Paterick Tagert       Son             M        10     Ireland
John Tagert             Son             M         9     Ireland
Mary A Tagert        Daughter     F         7      Ireland
Henry Tagert          Son              M        4      Ireland
Daniel Tagert         Son              M        0      Gateshead, Durham
Bridget Nichol      Visitor

Includes all the information except the Kelly surname: John as a father, Mary (A) at the 'correct' age, a brother, Henry, and Irish connection. Five brothers, one sister, and by the age of the parents, they could easily have several more boys before 1881.

Eddowes used the alias 'Mary Ann Kelly.' Another coincidence is that early press reports of the Miller's Court victim identified her as 'Lizzie Fisher', which was the name of Eddowes's sister. June 1889 Elizabeth Jackson, (murder victim -either she, nor her killer, were identified) had the name 'L.E. Fisher' written on the waistband of her drawers. They belonged to a domestic servant at Kirkley; near Lowestoft, and had been sold as rags by her mother while staying near her daughter in November last (1888). She was traced to Byker, near Newcastle, her father, who'd marked the clothing, and recognized his handwriting, to Bill Quay, on the Tyne.

Bill Quay is just 3.7 miles from Gateshead, home of the Tagerts. I'm not saying it means anything, but interesting nonetheless.

N.B The Tagerts became the Taggarts and moved to Liverpool. The family didn't increase and Mary is described as a laundress.