Talvez esse link possa ajudar.
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Always, when you sign in Skype from some computer, your Skype name stays forever in the Skype list menu. Sometimes it is not desirable to be seen that you have been entering in Skype from that computer. To remove your name , just make follow few steps:
Open a File Manager and in address field write %AppData%\Skype\ (so you may enter there manually – go to C:\Documents and Settings \”current user name”\ Application Data\Skype ).
You are now in the folder that Skype save it's system fails. There must be a folder with your Skype Name. If your Skype Name is Beauty23 , there must be a folder with name Beauty23.
Delete the folder, and you are ready. Delete only the folder that has such name as your Skype Name, if you delete something else , you may damage Skype.