I just checked a web site called Irish Family History Foundation, which has all most all of the civil & church birth, marriage & death records on it. You can search the site, but if you want to view the record you have to pay 5 euros.
Any way on this web site there is a Patrick Davern born in north Tipperary county in 1800,but no Patrick Davern in Co. Limerick in either 1799 or 1800. Hope this will be of help to you.
Suzanne