We are wondering, If we have an active program in Marketo that is synced with SFDC and we want to change the campaign name in SFDC, will it break the sync between Marketo and SFDC? Or will it continue to work as usual?
No, it will not break the sync. In fact, Marketo almost always detects the name-change in SFDC and automatically updates itself in any programs that you are referencing that campaign.