Hi Marion,
Welcome to Ireland Reaching Out!
Shanaghobarravane is a townland in the parish of Lislee in the very southern part of County Cork
I had a quick look to see if I could locate a baptism for William Kirby born about 1876 with parents John and Mary and found the civil birth record of William.
William was born on the 4th of March 1876 in the townland of Meelmane in Lislee county Cork, father John mother Mary Sullivan, see record https://civilrecords.irishgenealogy.ie/churchrecords/images/birth_retur…
The 1901 census shows the family living at the address house nr.5 townland of Shanaghobarravane in Butlerstown county Cork, it shows both parents and William and his 3 siblings, his fathers name on the census was John Con (John Cornelius Kirby) http://www.census.nationalarchives.ie/pages/1901/Cork/Butlerstown/Shana…
It is possible that some of William siblings remained at the same place a good website for research is www.rootsireland,ie it is a subscription site and of course the free site for civil and church records www.irishgenealogy.ie
I know of at least one Kirby family living in Butlerstown near Bandon county Cork, maybe a visit to this village and a chat to the locals might tell you more
Hope this helps a bit
Anne Marie