Sure! For the prepaid cards, they came with a unique token because at the time they are produced, they are not linked to any account so we used that number to link them to your account as well as perform other actions that would otherwise require the full card number.
Unfortunately, this caused some issues with card acceptance, especially in the US! For the debit cards, the app allows you to select between legal and preferred names if they are different.
You can request a replacement card through support that has an abbreviated or otherwise reasonable form of your name. For example, somebody named Jane Doe could certainly have a card that has J DOE embossed on it. 
A small number of early debit cards contained no name at all or had MONZO BANK written in the name field. We are looking to bring this back as an option at some point!