Hello Wifienoit18
Welcome to the SBB Community.
Please kindly note, we are a customer support page run by volunteers, not the SBB Customer Service.
You should indeed book the Saver Day Passes with the names as present in the passports. Up to three typos are accepted provided the date of birth or the name is correct.
Nicknames are not global and therefore not accepted on legal documents. Should you book more tickets, please enter the names as in the passport.
Please contact SBB: +41 51 225 78 56 (24/7); from the U.S.: 001 41 225 78 56 (24/7) to see what you can do.
Kind regards,
Roland