there is this
twitter account that posts once upon a time spoilers, and it's pretty accurate.
they just posted only this
לילית which is Lilith in Hebrew,
Swens theory is that Lily is short for Lilith, there's also an episode called Lily (4x19).
I also want to point out something that swen or no one posted about.
In 3x22 When Emma and Hook where in the Dark one's Vault there is this giant statue of
pazuzu.

In Assyrian and Babylonian mythology, Pazuzu (sometimes Fazuzu or Pazuza) was the king of the demons of the wind,
and son of the god Hanbi. He also represented the southwestern wind, the bearer of storms and drought.
Pazuzu is the demon of the southwest wind known for bringing famine during dry seasons, and locusts during rainy seasons.
Pazuzu was said to be invoked in amulets, which combat the powers of his rival, the malicious goddess Lamashtu,
who was believed to cause harm to mother and child during childbirth.
Although Pazuzu is, himself, an evil spirit, he drives away other evil spirits, therefore protecting humans against plagues and misfortunes.
goddess Lamashtu wiki says:
In Mesopotamian mythology, Lamashtu (Akkadian dLa-maš-tu; Sumerian Dimme dDim3-me) was a female demon, monster,
malevolent goddess or demigoddess who menaced women during childbirth and, if possible, kidnapped children while they were breastfeeding.
She would gnaw on their bones and suck their blood, as well as being charged with a number of other evil deeds. She was a daughter of the Sky God Anu.
Lamashtu is depicted as a mythological hybrid, with a hairy body, a lioness' head with donkey's teeth and ears, long fingers and fingernails, and the feet of a bird with sharp talons.
She is often shown standing or kneeling on a donkey, nursing a pig and a dog, and holding snakes. She thus bears some functions and resemblance to the Mesopotamian demon Lilith.
This right here:
"She thus bears some functions and resemblance to the Mesopotamian demon Lilith"
They better not go there, Cause as a satanist i have high respect for Lilith.