Can one be asked (by law) to change their business name ? -

If a business is using an unregistered business (ie didn t register the name at the ministry), can they be asked to stop using that name if somebody else registers that same name? Also by law can the unregistered business just continue using the name if no harm is being done?

Yes, if you are using a name that someone else has registered, DUH, it s the law, that s why there is a registration process