Crossword puzzle clue "something whose name is not known"

Something whose name is not known

Actor whose first name is the title of a Best Picture he co-starred in, and whose last name is that film's director

"Something's Gotta Give" singer who goes by her middle name, not first name (Margaret): 2 wds.

Persons whose names are not known.

New element whose name will be ratified in January, 2010, and whose symbol appears in the middle of this puzzle's theme answers

Hip-hop artist whose name is a homonym for something he DJs with

Literary figure whose name is a letter short of something he wrote

Actor Jonathan, whose name sounds like it's worth something