Did you know that Italians recycle names so that one person might be named the same as his uncle, father or grandfather, for example? Maybe he was baptized with more than one name so he adopted sometimes one of them and other times a different one. Have you searched in Portale Antenati? Read the Lucca archive notes clicking the Explora gli archivi at the main homepage and then scrolling down to find it. Open the link and read. You might find more info available, like some parrish records.