I think using Martha would put you a bit ahead of the curve.
As a Doctor Who fan...this one has already crossed my mind (except for the Marty part.)
I have a girlfriend name Martha and she's sweet, but dull, and that's exactlty how I see the name. Just my 2 cents though!
Martha is kind of sweet, but Marty makes me think of Grease.
I like Martha. It's definitely on my radar screen. It's so classic and historical. Half of the U.S. founding fathers had wives named Martha.