[header] How to change your tumblr name [title] Change your blog name only if you are sure that you are ok with changing the url on your tumblr account. [step] All links to the former name will be broken. If you share blogs a lot, you may want to consider simply adding secondary blogs in place of a name change. 
[title] Decide on the name you want to use in place of your old name. [title] Add a secondary blog to your newly named tumblr account if you want to retain the old blog name.