@nickantonaccio 's method is probably the best way to go if you are always going to use these names in your app.
If you don’t like the clutter of a 50k word list in your server module code, create a second server module containing just this list of names and import it into your main server module code like explained here:
The loading and unloading through the iteration of 50k data table rows every time the function is called is most likely what is timing out, for such a (relatively) small amount of memory to load.