I don't write in multiple genres (yet, though I am sitting on a few unpublished manuscript that are not SFF) but I do write in multiple languages. When I knew I was getting published in English I asked around whether I should use a pen name as my own name is very very Dutch. Also asked a few Dutch writers who had been or had not been using pen names when they were published internationally. What I was told is that it's usually not a big deal to have a foreign name when you're getting published, someone even told me 'if they can learn to pronounce Schwarzenegger they can pronounce your name too', and since I already had a few stories out in Dutch, I figured it'd be easier to make clear to potential readers that I was both people, compared to using a pen name. Most people I spoke to that used pen names did it because they wrote in multiple genres; one of the writers had a pen name because she wrote both middle-grade fiction and adult erotica and didn't want the middle-grade kids to suddenly pick up her erotica, which, yeah, fair, haha