Meaning of Breaking Bad’s Felina

The last show of the Breaking Bad series is called: Felina.

There are several observations I’ve seen made about this title.

1) It’s a song title.

2) It’s an anagram for “Finale”

3) If you take the letters, Fe, Li, Na. That’s Iron, Lithium, and Sodium. That’s an ingredients list. Iron is in blood, Lithium is in meth, and Sodium (salt) is in Tears. Blood, Meth and Tears.

Not sure which of these are which, or even if they were intentional, but man, I hope number 3 was.