What means the name Britania?

I tested it with both the old name of Britain. The new results provide me: Breton Tann (oak [place] in Gaelic) and Pretanike (in front the oak [land]), therefore Britain, probably means the land of the oak (Druids' sacred tree). In this context it is worth mentioning the name of Gael, the ancestors of Irish Celts means forest people (Goidels). The name Irene and Albion (Pickt = color) of Britain mean sequentially eagle and the white colored. In the Nordic Yggdrasils Ash myth regard we both tree and sea eagle (that sits on the top of a huge tree).