Hi,
Getting back before civil registration (circa 1864) is difficult. Killaliss is a townland in the parish of Knockbride.
Having said that Rootsireland.ie do have some church records that predate that. It is a subscription site but you can join for short periods. I had a quick look and found the following:
Samuel Read Date of Birth:
Date of Baptism:03-Jan-1830 Address:Cornary Parish/District:KNOCKBRIDE Gender: Male County Co. Cavan
Denomination:Church Of Ireland
Father:Samuel Read Mother:Anne Read
Occupation:Weaver
Sponsor 1 /
Informant 1:
Sponsor 2 /
Informant 2:
© 2019 Copyright Cavan Genealogy. The townland is Coroneary in the parish of Knockbride
You may find some more there. I looked at the grave records for Church of Ireland, Knockbride but there was nothing by that name. It is not a very common name, do search under Reed/Read & Reid.
I also looked at the Flax Growers of Ireland, 1796 - County Cavan on https://www.failteromhat.com/flax/cavan.php and there are 2 names, one each in Drung & Drumgoon, neither would be too far from Knockbride.
There is one entry on Griffiths Valuation on askaboutireland.ie, it is a free site. Also free to search are the civil records on irishgenealogy.ie
On https://genealogy.nationalarchives.ie you will also find wills & extracts which are also worth a search.
You can also contact Cavan Genealogy Centre they undertake commissions and may be able to help you further.
Cavan Genealogy
1st Floor, Johnston Central Library, Farnham St., Cavan
Tel: +353 (0) 49 4361094
Email: cavangenealogy@eircom.net
I hope I have give you some direction.
Regards Carmel O'Callaghan