To migrate the data into your mendix app you can use the database migration module from the appstore: https://marketplace.mendix.com/link/component/160
Not sure why you would need the database tablenames to be exactly as they are in they old database, but this is not possible as the tables will be generated and named as module$entity in the Mendix database. From the Mendix model you would be able to expose the data though without the need of the names being equal to the current names, I think.