I'm going to conduct an email-based questionnaire survey, but I would like to avoid sharing my real name/affiliation. In part, I'm curious if sender's name is actually going to affect response rate and include this aspect as a part of my study. Can it be considered unethical not to use my real name?
This is going to depend on your IRB/ethics review. Not revealing your name is probably ok. Hiding your affiliation is going to be harder since the IRB will want to guarantee the participants can contact someone if there is a problem. That said, if it is relevant to the research, the IRB can probably work with you to figure out something that works.