The location detection in Ethnio is done using GeoIP, which basically means we look at a combination of IP address and browser strings which generally include location. This practice isn't perfect - location detection only has about 88% accuracy, but it's meant to at least offer some ability to sort or filter on the responses page.
You can disable this feature under account >> profile but it's turned on by default. Assuming you have it turn on, the location will be displayed underneath each Respondent name under Responses:
A note on gender inference by name
There was a feature that previously automatically inferred gender from name, but that practice was disabled to better address the complexity of gender identity. Most researchers use a more nuanced gender question along these lines, which is what we'd recommend: