It may depend on the credit card driver you're using. I have fifteen restaurants on Res 4.11, three on Res 5.2 and two on Res 4.9, and the options to mask cardholder and name is disabled on all of them. The one constant is the transaction vault CC driver.
I'm sure you have a reason for wanting the cardholder name, but honestly if I saw my name on the voucher I'd complain to the manager and not return to that establishment, at least not with a credit card.