What things do I *need* to use my legal name for?

One relatively easy privacy step someone can take is using fake details. Such as names, for as many things as possible. In the case of names, some obvious exceptions would be legal documents, applications, banking stuff, etc., but there are also some less clear ones like shipping details. So, what are some of the less totally obvious things to \*avoid\* using fake names on?

legal name privacy things