Sovereign has everything to do with power. It often describes a person who has supreme power or authority, such as a king or queen. God is described as sovereign in a number of Bible translations.
My Mom repeatedly told me over the years that I was born with a veil over my face. I didn't really know what it was at the time so I researched and looked it up. It's being born with a layer of skin over the face. Doctors would surgically remove it. I also found out that a person born with a Veil over there face is also called a Caulbearer.
I think the legend that you're referring to is that people who are born with their amniotic sac over their faces see spirits, not an extra layer of skin over their eyes. There's a similar legend about people who are born inside the sac without their mother's water breaking. It's not very common.