I looked up Mar and found that in Spanish it means of course sea/ocean, as we all know, but it also means
a lot of/abundance.
la mar - abundancia jede Menge
la mar - abundancia die Unmenge
(
Leo dictionary)
la mar de loc adv (gran cantidad) a whole bunch of n phr
loads of n phr
tons of n phr
scads of n phr
wordreference dictionarywhich makes sense, because if I have a whole sea of [whatever], I sure have an abundance of it.
Not sure what to make of it though.
As far as Ennis goes, I found interesting things (I think).
Ennis means island, which is also not new, and in connection with Del Mar still makes the most sense to me: island in the sea.
However, Ennis also means "The only choice" in gaelic (
meaning of names.com). I also found a definition that translated it with "one choice".
Now this I can relate to Ennis. He's a 'one-man-man'; he made his one choice with Jack and that was it for him. He also made the only choice he could make in regard to not living together and stuck with it till the end.
He also was Jack's one choice (Radall and Mexico be damned).
I think this "one choice" theme fits nicely with Ennis' character.