Beauregards and other "umbrella" 1er Crus

Chablis Premier Cru (1er Cru) is one of my favourite French whites for seafood and I have tasted a number of different crus. My first ever encounter was with a Beauroy which my sister bought from Marks and Spencers whilst we were studying in London many moons ago. I see many examples of the following names in Hong Kong - Mont de Milieu, Montée de Tonnerre, Fourchaume, Vaillons, Montmains etc. Recently I bought one that I haven't met before - Beauregards. It turns out that there are some 40 1er Crus in Chablis and some 17 of them are more often used on the label than others - they are sometimes nicknamed the "umbrella"1er Crus. Different small climats are "attached" to different "umbrella"1er Crus. Although the latter are usually seen, I have also met the smaller climats on the labels too.