As a Pagan, I am also interested in witchcraft and the ways of the Wiccan. I do like the aspect of using spells to help myself and others in areas of health and their success.
There are many Deities out there who are associated with Witchcraft, and I am going to name a few here.
1. Diana (Artemis) is a Moon Goddess and also a Huntress. But she was also a protector of witches and witchcraft. She survived the darkest times of the Middle Ages and the terrible witch hunts which shows how powerful she is. While Diana is the Roman name, I do prefer it as it sounds regal like the namesake.
2. Hekate (Hecate) is a very powerful and ancient Goddess also associated with magic and witchcraft. Sometimes she is shown as an aspect of Diana, but was worshiped in her own right. She was a Titaness and was one of the few early Greek Goddesses and Gods to remain of high stature when the younger ones came to power.
3. Selene (Luna) is a Moon Goddess and is also associated with witchcraft. She is the embodiment of the Moon, although is depicted as a beautiful nymph. She also is very ancient and is one to call when doing any spells under a full Moon.
4. Mercury (Hermes) while he is generally known for knowledge and the Messenger, he does have some magical abilities and can be used as a witchcraft Deity.
5. Lilith is a very ancient Goddess who is even mentioned in the Old Testament of the Bible. Not many other deities can make that claim. She is also a protector of witchcraft and has been cast as an evil entity by the Church.
6. Cybele (Kybele) is a very ancient Goddess who may be one of the original ones worshiped. She is a Mother Goddess, but is also known as a protector of witches.
There are others out there to choose from and it is a very personal choice. If there are other personal deities others follow, feel free to share here if you like.