If your name is on the accounts as a joint signer or you live in a community property State and she opened the accounts after you got married then yes your liable.
If on the other hand your name is not on the accounts and you either don't live in a community property State or you do and the accounts were opened before your were married then no your not liable.
Community property States are as follows;
AZ, CA, ID, LA, NV, NM, TX, WA & WI.
Now since she is being taken to court if the credit card companies win and get a judgment they can attach bank accounts even if they are joint and file liens on any real property she may own or have her name on like cars, boats, land and homes.
And weather she goes by your last name or her maiden name makes no difference.
Finance Manager for over 9-years / 2009 edition Consumer Action Handbook.