Hi Kiri
Welcome to Rootschat!
If he married in Scotland, there will be a record in Scotland. There wiil be a mention on the BMD Index for Scotland. Then you can look for a marriage certificate It will give father's name and names of witness and occupation and probably more in Scotland.
It may be worth joining Scotland's People or maybe someone will do a lookup for you.
By this date there will be civil records in Ireland too.
If you really know nothing else, you can look for a death record and that should give and age at death, and where it occured. The certificate will give who repoted it and the cause and again probably more.
If this prompt an idea of any information at all, post it and I'll look for the right links or maybe if we narrow it down, someone wilIf he left in 1917, he should have been on the 1911 and maybe 1901 census for Ireland. The Dublin 1911 is now online and free. There are links from the post at the top of the page. I'm asuming there's a link as you've posted here.
He may also, if he was old enough have been in WW!. Whichever country he was in when he signed up, as it was before 1922, his military records would be in England.
There are medal cards on Ancestry, still not complete, (Free in some local libraries or someone may look for you. Also on there are WW1 Pension records that survive and a few service records that survived thge fire - not all on yet.l do you a lookup.
Good luck.
Do keep asking.
Best wishes
Emms
PS, yes, anyone who caught me, I missed the Scotland at first and had to change it!