French Church Portarlington records show that Watsons were in the area in the 18th century.
1726. David Watson, son of David Watson and Charlotte Elizabeth (nee Guoin) was baptised 15 July. David Watson was dead in a few years as in 1731 Jaques Bihea of Bally married Elizabeth Watson (a widow nee Guion)
Births in Lea Parish, Portarlington
1809 Oct 10, James Watson, son of ? Watson and Elizabeth of B'britas, publican
Deaths
| Died | Name | Age | Implied birth | |
| 1882 | William Watson | age 70 | 1812 | Mountmellick Sep 1882 vol3 p333 |
| 1892 | William Watson | age 62 | 1830 | Mountmellick Sep 1892 vol3 p301 |
| 1892 | William Watson | age 72 | 1820 | 17 July 1892 on headstone |
| 1892 | William Watson | 30 Oct 1892 age 45 on headstone | ||
| 1896 | Elizabeth Watson | age 75 | 1821 | 5 Dec 1896 age 75 on headstone |
| 1898 | William Watson | age 81 | 1817 | Mountmellick Mar 1898 vol3 p400 |
| 1900 | William Watson | age 77 | 1822 | Mountmellick Mar 1900 vol3 p493 |
| 1945 | George Watson | 26 Jan 1945, verger |
1825 Tithe Records
| Co Laois | Mountmellick | Rosenallis parish |
| Mountrath | Offerlane parish | |
| Abbeyleix | Dysartgallon parish | |
| Near Athy | Killeshin parish | |
| Co Kildare | Monastervin | |
| Ballydrommey parish | ||
| Co Offaly | Portarlington | Clonsast parish |
| Ballykean parish | ||
| Tullamore | Gleashill parish | |
| Clara | Horselean parish | |
| Kilnamanagh parish | ||
| Monasterois | Ballynakill parish | |
| Castlejordan parish |