"Saint Patrick's card"
Translation:Cerdyn San Padrig
As far as I recall it was Dewi Sant but here it is San Padrig?
Yes, and for the most part you'll see "Sant/Santes come before the name". "Dewi" is a special instance because he is the patron saint of Wales and therefore he comes before the "sant". I can't explain why it's "San" though instead of "Sant" though I imagine it's just an exception to the rule.