That's a good one!? I have never seen it.
If I recall correctly, "Enjay" was a spellout of "NJ" or "New Jersey," my home state, similar to how "Esso" is a spellout of "S.O." for Standard Oil, in this case "of New Jersey" which was one component of the broken-up Standard Oil Trust.? With ExxonMobil, also known as Standard Oil of New Jersey plus Standard Oil of New York plus lots of other companies, a lot of that trust is back together again... but I digress...
George (your list-owner)