What does the last name bernal means?

Some Spanish speakers tend to interchange the letters b and v when they write. If such an interchange is made in the case of this last name, you come up with a Word that is cognate with the English Word vernal, which is a reference to spring, the season. (Perhaps you've heard of the vernal equinox. ) Vernalis also a Spanish Word. It means the same thing in Spanish as it does in English, and it's spelled the same way. This could be the meaning of this family name.