Marval Movie

and we are off and running in the challenge.

Most popular names of the 1920s - Betty for girls

Betty and Barbara in the 1930s

and in 2010 - Boys names with B - Benjamin, Brayden, and Brody
Girls in 2010 - Brianna, Brooklyn, and Bella

as for my B character names - Drat -  Beatrix is taken thanks to Divergent

Thus I shall pick Blair - it's Scottish and means "from the field of battle".  This young lady will have cropped red hair, piercing green eyes, and she carries a sword in her left hand. Fleet of foot, she helps her village regain their riverfront rights.

As for a boy - I pick Baldwin. From the German, it means "a brave friend", and I think my gal Blair could use a faithful follower. Baldwin is shy, but reliable and resourceful. He's able to extract secrets from other towns, just by blending into the background and listening.

(source - Complete Book of Baby Names edited by Lesley Bolton)