I'll just say it: Wiccans have pantheon-envy.
The gods of the Wicca are Twofold: the Lady and the Horns. Instead of viewing Them, however, as the gods most specific to witches within the framework of a larger (but lost) pantheon, most Wiccans (unfortunately) have chosen to prefer Dion Fortune's 'All gods are one god, all goddesses are one goddess' bitheism, a choice which (frankly) has not only retarded Wicca's mythological and theological growth, but has opened the gate to the much-vexed problem of cultural appropriation. If all god/desses are one god/dess, then we are entitled to steal Anyone we want from someone else, and it's all grist for our mill.
It's easy to understand why, when encountering the vibrant pantheon and living culture of, for example, Santeria, witches feel envious. What Santeria is now, the Craft used to be. Alas, how much has been taken from us.
But our choices are not limited to either cultural sterility or cultural appropriation. There's another way to navigate these waters.
If, instead, we regard the Horns and the Moon as Two among a larger (if lost) pantheon, then (to take an example) let us ask: How do you say 'Yemayá' in Witch?
Allow me to rephrase the question: What does the witch Goddess of Waters look like?
Let us start with the Moon. The witches' Lady of the Living Waters is—essentially—the reflection of the Moon on Earth. What Moon is in the heavens, She of the Waters is on Earth.
Moon, of course, was born from Sea. (Where She came from originally is what we now call the Pacific Ocean. For witches, there's no gap between science and religion, just a difference in framing the language.) Who has not seen the image of the full Moon floating on the waters of a lake, or the sea, and thought: ah, yes.
We could call Her the Mermaid Goddess, and praise Her fish's tail. Mermaid lore is widespread across Europe, and all of it pertains to the question at hand. In fact, iconographically speaking, the modern Yemayá derives Her fish's tail from European, not African, iconography. Living cultures borrow from one another.
When confronted by a lack in the ancestral lore, it's usually wisest to look at how other peoples approach the matter.
But to then take their lore lock, stock, and barrel (= the component parts of a gun) is, in effect, armed robbery.
Better it is to translate.
Better to learn what we may from others, and then to ask: So how do we say that in Witch?