Duchy of Hamburg
Druidism is not a solid religion, everywhere there are cults to every deity, and certain countries find certain deities more important than others.
For an example:
In Armorica, The Morrigan, Taranis, Gofannon, Henwen, Somhlth and his still corporeal twin Kele-De, and Grainne are more important currently than the other Deities. This does not apply to other Keltic Nations.