I have an organisation which has several branches. Now I have a list of all these branch names. How can I call this list?
Branches name list? or Branch Names list? or Branches Names list?
What is the rule for pluralizing compound words?
In this instance you are talking about The list of branch names, so the best title would be the Branch Names List.
Because you are choosing a title and there is no grammar involved, either of the other two might serve your purpose - but they don't fit the role comfortably.
While the pluralising of compound nouns is always tricky, there are helpful guides online :