Also used in Spanish. It is considered both a Spanish form of Dinah or a short form of names such as Bernardina or Claudina.There are 3,860 bearers of this name in Spain. (source: Instituto Nacional de Estadística). [noted -ed]
Dina is also used as a feminine name in Egypt. A famous American actress with this name is Dina Meyer. As a woman's name, I regard it as a nice, refined name.
I work as a reservationist for an airline. When I have a customer that has the same name, they usually are born in the 60's. When asked most say they were named after a popular actress of the time, most likely Dina Merrill. This could explain the sudden popularity at the time.
You'll find numerous bearers on social media.