By default, when you drag database objects that have names ending in 's' or 'ies' from Server Explorer / Database Explorer onto the Object Relational Designer (O/R Designer) , the names of the generated entity classes are changed from plural to singular.
This is done to more accurately represent the fact that the instantiated entity class maps to a single record of data. For example, adding a Members table to the O/R Designer results in an entity class named Member because the class will hold data for only a single Member.
Pluralization is on by default only in the English-language version of Visual Studio.
To turn pluralization ON and OFF
- On the Tools menu, click Options .
- In the Optionsdialog box, expand Database Tools.
- Click O/R Designer.
- Set Pluralization of names to Enabled = False to set the O/R Designer so that it does not change class names.
- Set Pluralization of names to Enabled = True to apply pluralization rules to the class names of objects added to the O/R Designer.
Source : MSDN