Where is/was Goulane, Gowlane in Aghagower Parish

Townland names sometimes changed over time, and there does not appear to be a townland in Aghagower/Aughagower now by that name.  There is also the possibility that it was what is known as a "sub-townand", a name used by locals for an area within an official townland.  Sub-townland names did sometimes appear in older records as townland names.

There are three townlands in Mayo, all based on the Irish name An Gabhlán ("the fork", like a fork in a creek), which have been anglicized as Gowlaun or Goulaun.  Two are in East Mayo, in the neighboring parishes of Kilmovee and Kilbeagh, and the third is in northern Mayo, in the parish of Crossmolina.  You can see all of them in the list of Mayo townlands at this link:  https://www.townlands.ie/mayo/

Sorry not to be able to help further there but, in case you are interested, I can provide some inffo about the Gavan surname.  There is an Irish surname originating in north Connacht, Ó Gáibhtheacháin, which was anglicized in several ways, such as Gavaghan, Gaughan, and Gavan (the Gaughan surname also exists in Ulster, but is based on a different Irish name).

Thanks for your prompt replies Kevin and Roger.  Sorry for the misleading information.  The two brothers are John and Michael, Daniel is their father.  John is in fact my great grandfather.  Daniel, my great great gandfather was married to Bridget Duffy.  From her side we have her brothers Philip and William.  Philip was born in 1828 in Eriff, Aghagower. Interestingly on Philip's birth certificate his father is given as Timothy but on Bridget's, (Daniel Gavin's wife), death certificate her father is given as Tady.  I am assuming Tady and Timothy are interchangeable.  Is this correct?

The reason I mention the above is that I see a Gowlan Bridge on an old map used in Griffiths.  It is down the road by about 2km from a place called Eriff Bridge on the N59.  Do you think this can be the Gowlan and Eriff mentioned on the certificates from Roots Ireland?  I, probably wrongly, made the assumption that Daniel and Bridget would live near to each other.  I also found on an 1837 Lewis map of Mayo where Gowlan is shown in the same area.  There is also a mention in a walking book of a Luga Gowlan https://books.google.co.uk/books?id=2wiWDwAAQBAJ&pg=PT135&lpg=PT135&dq=Luga+Gowlan&source=bl&ots=Jp8vhgPbws&sig=ACfU3U3nWyYP9LytF9Q4_Zk8sTBCMWGRQQ&hl=en&sa=X&ved=2ahUKEwi4qpXvzO_oAhWFXhUIHWDpCSQQ6AEwAnoECAsQKQ#v=onepage&q=Luga%20Gowlan&f=false  in the same area.

What you both have made me realise is that I need to do more research on the other Townlands.  The problem doing it remotely is that there is no sense of scale, distance, between places, e,g, distance between Sraheen and Eriff Townlands.

I have not looked any further into Patrick Gavin as I thought it would be quite a common name.  Am I correct in assuming it was normal for the tenant of land, e.g. Peter, to hand on his tenancy to his sons?  Or would it only be the oldest son?

I really do appreciate all your help and I will appreciate any background information on the Gavin's in Mayo, Kevin.  Also, I see Roger mentioned that the Townlands became more formalised after 1851.  Where will the best place be to study or read about this formalisation?

Finally, on the irelandgenweb.com site there is a link to an Aughagower Parish map stating it is from Pat Deese's website.  Unfortunately when I click on it the key to numbered Townlands on the map has been cut off.  Do you know where I can get a better copy of this map?

Once again, thank you very much for your help.

The Irish first/given name Tadhg was anglicized in several ways, often for the very same person, as Thaddeus or in a few cases Timotheus (both originally used in baptismal records where the priest "Latinized" the name), Thady, Timothy, and even Thomas, as well as phonetic transliterations such as Taig, Taigue, or Teigue.  I have a great-great-grandfather who lived in Mayo, and whose name was apparently Tadhg, who was listed in Griffith's Valuation as Timothy, in the marriage record for one child as Thomas, and in another marriage record as Thady, which is where the name finally settled. 

Unfortunatey, I don't more information about the Gavin family, except that I might have misled you with what I said above.  I see that you're turning up records using the Gavin form of your surname, and that may indicate a different origin.  In addition to the surname which I described above, there was also a Mayo family named Ó Gáibháin or Ó Gáibhin, which was anglicized as Gavan or Gavin.  As with Ó Gáibhtheacháin, the original meaning of the surname is uncertain, because the words gabh and gábh can have a number of meanings in Irish.  The names Ó Gáibháin and Ó Gáibhin originated in two places in Ireland, according to MacLysaght, one being North Mayo and the other being Cork (presumably, they are unrelated families).  MacLysaght says that the usual anglicization of Ó Gáibhtheacháin in Mayo is Gaughan or Gavaghan, so perhaps it is more likely that your family surname was originally Ó Gáibháin or Ó Gáibhin.

Thank you very much for the information.  I am now going to work through the other Daniel's, Patrick's, etc. mentioned above.  I will see if I can make a connection that way.  If I do manage to find out where Goulane was I will post it here so that it can be found in the future.

Thank you for that information Roger.  Very interesting blog from John Grenham.  The tenancy agreement about going to the oldest son is a line I can follow regarding Patrick and Peter.  Plenty time to investigate these lines at the moment.