I go by my middle name, which is a common name for both men and women. Probably more common for women these days, actually. For the two years that I’ve been on the job market, I have consistently gotten letters (rejections, acknowledgements, etc.) addressed to “Mr.______.”
I have a PhD. They should be calling me “Dr.”, not Mr or Ms. Why make assumptions about sex, and get it wrong, when there is a perfectly good and appropriate gender-neutral title available? This, to me, shows a lack of care and respect on multiple levels, as well as the blanket assumption that philosophers are all male.