Kavanagh - Dublin / Wicklow Boundary

My Great grandmother was Annie KAVANAGH (Born: 23 Oct 1863). Baptised 13 Nov 1863 (Kingstown, Dublin).  Emmigrated to New Zealand in 1884.  Married in New Zealand in 1890, to Anthony CONROY of Laois.

Annie KAVANAGH'S marriage certificate states that her parent's were John KAVANAGH and Rosanna DOYLE; whom were married on 27 Jan 1864, in Ballyoughter, Wexford (possibly lived in Ballydarragh, Wexford for a time).

They had 9 children, of which Annie KAVANAGH was the eldest (that I can find records of on Roots Ireland).

I get the idea that the family moved around, as Annie's marriage certificate states that she was born in Bray, Wicklow.

I am hoping someone can help me with the follow:

I hold a letter from John KAVANAGH, which is addressed from Crinken Cottage, Shankill, Dublin (1898); in which he updates Annie (in NZ) about her siblings.  I also found a document (Can't remember where from) but recorded in my notebook, that says that John was boen in "Thangana".  

I notice on Google maps that Crinken and Shananagh Park are close, and may have been on the same estate originally.  Could "Thangana" relate to Shananagh?

In the back of my head, I wonder if John was a garden at Shananagh Park?  Don't know if there are any records that may cover the estate of the time and the workers??