Most main crew and a large proportions of WW pursers do not even know who their manager is because our working life is predominantly on an aircraft. Crew arrive just before their flight briefing starts and then on their return go straight home, particularily the WW crew.
Whilst generally correct my partner, WW PSR, knows her manager very well and enjoyes regular contact and communication with her. She [partner] made the effort to do so and there is nothing preventing any other cabin crew member from doing the same thing.
After being invoved in a serious incident on a flight recently she recieved a call from her manager checking that she was ok and offering various services and support. I know some crew would accuse that manager of harressing them at home by phoning..!
Bottom line, staff / management relations is a two way street.
Any CC member that doesnt know their managers name must have applied zero effort in finding it out, it's all published after all. So manager AND CC fail equally in that example.