Find API Names Using a Function or Client Script

Find API Names Using a Function or Client Script

Hello,

Probably odd request, but we are wondering if is possible to find the API name of a field from a function or client script running on a different module? 

That could probably be worded better, but here's an example..

In Module A, we have users give us some information, including a field name of a field in a different module where they want us to grab some information.  

I can't imagine we're the only ones, but we've committed the sin of changing the name of a field, thus making the field name and the api name different.  So is there a way to take what the user gave us as a field name and find the API name?

Thanks!