The name Ama is a girl's name of Polish origin meaning "born on a Saturday". Ama and discussed in our forums with posts like "Names on NB that make you go WOW!".
From the experts:
Ama is a day name used by the Akan people of Ghana for girls born on Saturday. Names that reference a baby's birth by day of the week, time of day, or season of the year are common in many African cultures. Ama is one that can be used happily by parents who live in English-speaking countries. While there are many girls' names that contain Ama as an element and might use it as a short form -- from Amalia to Amaryllis to Samara -- there were only a handful of girls named Ama in the US in a recent year.