Is it possible to determine the gender of the next child based on the position of the crown on the sibling's head?

Greetings, 

There is a common belief that one can know the gender of the next child based on the position of the crown (קודקוד) on the head of the preceding sibling. If the crown is in the middle, it indicates a girl; if on the side, a boy. Is there any basis for this? 

Another question, I am considering future names should Hashem bless us with a daughter, and I have thought of the following names: Daria, Hodaya, Avishag, Sivan, Inbal, & Inbar. Are these good names that will bring blessing? Besides these names, I do not find any others I feel connected to.