You mentioned that the person who gave you the ticket is an Cast Member or employee of The Walt Disney Company and Affiliated Companies. If it's a Cast Member Complimentary Ticket (in the form of a
Disney's eTicket or a plastic- or paper-stock ticket with
NOT FOR SALE in majuscule on the back), it can indeed be used by someone other than the person identified on the ticket.
Otherwise, as mentioned, all
Disneyland Resort tickets are nontransferable and must be used on any and all days by the person to whom they are issued.