DracoJesi
So I have to take a moment and say this...
I've seen on the forums at large and in various guilds where people have mentioned the "Lord and Lady of the Isles" and that they are the Lord and Lady of Wicca, that no other names are valid and that these names are secret, known only to initiates.
Well I need to clear this up. Now Obviously I'm not going to tell you what is in a Gardnerian Book of Shadows, but I will tell you that the names used by Gardner were not of the Isles.
When someone says they just be of the isles that's a flag that they don't know at all what they are talking about or have got the historical context wrong. This statement comes from a comment Garner made that has been taken out of context. He was asked which Gods which gods hhe and his Coven worked with and he did mention "of the isles" but it's the reason he gave for this that is important. He said the gods of the isles because they worked on the isles and so those deities are connected to the land there and that witches elsewhere would likely change the names accordingly. So basically he's saying to be in good relation with the gods of the region you find yourself. This of course makes allot of sense when you consider the Sabbatical cycle is very much about the land.
Secondly regarding the "secret names" there is truth to this. You are given the working names in the BOS at 1st degree (these names are known today by anyone who has studied the history of BTW) and then at 3rd you are given another set of secret names for the Lord and Lady. These remain secret but the thing is, is that they differ from Coven to Coven..... the names are specific to the working group in question as to protect the egregore.
This is very very true, even covens in the same area geographically will have wildly different names used. Sometimes when a new HPS or HP are put in place the names used might change dependent on how the rituals practiced by that coven change.
A lot of people use the Greek / Roman or Egyptian names when referencing specific deities , though those names may or may not be used in ritual.