Hello History Lover,
Welcome to Rootschat. The internment records for Wellwynd, Broomknoll and Chapel St (the 3 churchyards within Airdrie burgh) have either not survived, never existed in the first place or are lying in someones attic!
So all we have are the monumental inscriptions and for Wellwynd, a list of lair owners that was probably compiled about 1850.
I can find no Devlin or Hughes mentioned in any of the monumental inscriptions (MIs). The Wellwynd lair purchase list has a Neil Hughes, miner, Airdrie buying a lair on 6th August 1840.
No new lairs were sold in any of these 3 churchyards after 1879, after that date New Monkland parish churchyard and Ryden Mains cemetery, (both at Glenmavis), Clarkston churchyard and St Josephs R C cemetery were, I think, the other options if you lived in Airdrie.
New Monkland churchyard has records from 1842.
Ryden Mains (adjoining the churchyard) has records from 1879.
Clarkston churchyard has records from 1840.
St Joseph's Dykehead Road has records from 1860.
All the existing records are now held by North Lanarkshire Council at Bellshill. At the moment these records are in the process of being digitalised. They may or may not be available online when the project is complete, I don't know if that decision has been made, or if it is to be on a pay-for-view site.
Good luck with your research.
Lodger.