# [MATL](https://esolangs.org/wiki/MATL), 18 bytes

The current version ([4.0.0](https://github.com/lmendo/MATL/releases/tag/4.0.0)) of the language is used.

This applies the same regular expression as [NinjaBearMonkey's answer](https://codegolf.stackexchange.com/a/67555/36398):

    j'^[A-Z][a-z]+$'XX

The output is the string (which [is truthy](http://meta.codegolf.stackexchange.com/a/2194/36398)) if it's an official name, and nothing (which [is falsy](http://meta.codegolf.stackexchange.com/a/2194/36398)) if it's not.

### Examples

    >> matl
     > j'^[A-Z][a-z]+$'XX
     > 
    > December
    December
    >> 
    
    >> matl
     > j'^[A-Z][a-z]+$'XX
     > 
    > ASCII
    >>