Must admit that I have always wondered about the name "Cal" is certainly not, by any means, a traditional or much used name in England, I was tending more towards "Callum" although that is more Scottish. Whilst on the subject of name tho, I am a little confused on the surname part now as well. Having had it pointed out to me in no uncertain terms that the woman in the black and white footage that Cal studies in "Depraved Heart" series 1, that committed suiside, was actually Cals mother (yes I missed it, thicko me!) but, having established that in my brain now, how come, in that episode she was referred with the surname of "Mason", and yet we have Dr Lightman?.....Any thoughts????

In "Lack of Candor" Cal tells Gillian that his dad was not around and his mom died when he was young so his mom probably did have his dad's last name. Lightman, I'm assuming, is his dad's name.