A warm welcome to TalkingScot ljmacq !
https://www.scotlandspeople.gov.uk provides, on a very quick check, the following references just searching for Richard McQuillan. Scotlandspeople is a fee-based service of the official bmd and census records of Scotland. To view
full records, you must set up a pre-paid account.
Search the statutory (civil) registers of births, marriages and deaths in Scotland from 1855 to the present.
Births
login to view 7 records
Deaths
login to view 6 records
Marriages
login to view 2 records
Catholic registers - Banns and marriages
login to view 1 record
https://www.familysearch.org/ is an option which provides a 'free account'. It now requires that you register for a 'free account' which gives you limited access to their records. Be aware that the page also is a gateway to signing up for a 2 week trial for which you must supply your credit card. If you fail to remember to cancel, they will automatically charge your card, and you will have to pay the full annual subscription. So, if at any point you are asked for your card info, you are signing up for a paid subscription.
I've had a quick check on
https://www.freecen.org.uk/ but the records that surfaced for Mcquillan seem to all be from England.
The following site also shows some records, but again, this is a pay site, containing British records, so a good number will be English, rather than Scots.
https://www.ukcensusonline.com/search/index.php?fn=Rich
Forename Surname Age Occupation County Estimated Year of Birth Place of Birth
1841 - Richard Mcquillin 25 Cotton Weaver Lancashire 1816 Ireland
1851 Only English residents found - ages unsuitable
1861 - Richard Mcquillen 42 Cotton Weaver Lancashire 1819 Ireland
Hope this is of help, rather than being overwhelming.
Frances