Conversation so far:
how did m and m get its name
M&Ms were named after the surnames of the company’s founders: Forrest Mars and William Murrie.
how did  snickers get their name
The Mars family named the candy bar Snickers in memory of its favorite race horse. This bar was introduced in 1930.

Question: How popular is the brand
Self-contained rewrite: How popular is the M & M brand