There are several good reasons to use a name other than your usual one, but only when it is appropriate to do so.
There are also quite a few areas of life in which a pseudonym would be inadvisable, for example when applying for a bank account or a passport.
When should you use a pseudonym?
Pseudonyms of famous people
More about pseudonyms - Wikipedia
List of pen names
List of stage names
More about pseudonymity
Well, it is time for "Via" to sign off now and become the person her family knows.
Do you use a pseudonym online and/or in life?