I am new to this stuff and am progressing nicely with some parts of my family tree. I am getting a little stuck with some other bits though - looks like boundries have moved etc.. and it's all rather Baffling!!!

My family from what I gather is from Co Mayo - A place called Toobrackan - Kilcommon is the Parish and Castello is the Barony is what I have found so far.
My Grandfather was Thomas Phillips. His father it looks like was Myles Phillips (looks like he had a brother Myles known as Ned??). I did find 1901 census info relating to this.
Now my problem is - my Aunt talks of the family farm / land being known as what she thought was "Derrenabrack" - does anyone happen to know how this relates or whether it is a completely different thing?? I can't find anything with "Derrenabrack" at all (lots of derren??? places - but nothing like she says) Is this a much older thing altogether - perhaps names changed over years??
I really don't know if the "Derrenabrack" is a farm or land inside Toobracken?? (By that I mean Toobracken is a townland - my famillies farm is within that townland??)
Is there anyone out there who has more experience and knowledge than me that could help me with that point please??
I will be grateful for any help - I just have tried lots of searches and trying to peice that information together.
Thanks Lizzy :0)