I'd have voted if there was a box for FemShep, but there is only Commander Shepard. The female VO just had much more character compared to the male version and I don't want to vote for the male version half at all.
Fem shep is commander shepard. Femshep is just an alternate name gamers created to separate the sex, its not real. If you were in the marines and was to address the female version of shepard you would state her name the same exact way you in which you would the male.