you'll need to check
Knox to Irwin where Knox is buying land in Cork from Irwin and Widow Boyle., Col Irwin's wife was Widow Boyle at time of transaction, and then she is in Sligo referred to as
Lady Anna Irwin.
https://www.logainm.ie/en/44812 Tanrego is where they are on Deeds... if you click on Open Scanned records, go to slide 4 and you'll see him referred to as Colonel Irwin.
Later he is selling land to a pile of Irwins for an Army Promotion. Earlier there is a
Jones to Irvine Deed from late 1600's being endorsed in early 1700's when Reg started 1708, so they were there in late 1600's and the Irwins and Jones married at some stage too as they are listed here. These are at various locations including Carrowkeel next door to Ormsbys.
You'll need Irwin to Stewart, Londondery plus Irwin to Phibbs, Jane Irwin was nee Phibbs.
Then
Anne Irvine married a Stewart. so at least one connection.....he dies and she remarries Mills in Roscommon so you'll need
Mills to Irwin. (see snippet, which might be allowed have no problem if it is not.)
https://www.logainm.ie/en/44812 Tanrego West click open scanned records, see slide4.