In SharePoint 2013, UI wise a lot of changes are placed. We can have top links, includes Sky drives, news feed, Sites etc in right side and SharePoint text in left side. We can change the all the text by customizing the link details.
We can change the left side text by using powershell commands. To change the text, Open SharePoint management console with admin privileges. Write command get web application by using Get-SPWebApplication command
$webApplication = Get-SPWebApplication "Web Application URL"
Get SuiteBarBrandingElementHtml and update the text by following command.
$webApp.SuiteBarBrandingElementHtml = "Suresh Pydi Blog"
Once we update the control text we can it as shown below.