Is there any easy way to know the link between designations like 'en5' and the word names? I see both being used but all I know a out are world names, so things like en2, en5, are meaningless to me.
Yes, the names are alphabetical, with the exception that there is no 'I', so up to Houndsmoor it's easy: en1 = Arvahall, en2 = Brisgard, en3 = Cirgard, and so on up to en8 = Houndsmoor.
From there it gets a little tricky, as with no 'I' world the number is one out from Jaims onward: en9 = Jaims, en10 = Korch and so on up to (so far) en14 = Odhrovar
Also: if you play on browser, check the url for the world you are logged in to - you will find enxx (where xx is the world number) as part of the url