For a boy we have decided, after much huff and indecisions, to name him Lucas Warren. The girl's name we decided on came MUCH easier and quicker; Ilse Elizabeth.
Edit: I should mention that until we know gender, we're affectionately referring to the bump as "Groot" after the character in Guardians of the Galaxy and how, at the end, the Groot baby was dancing... This child is ALWAYS wiggling about to their own music at every scan.