I don't think Perkins is a Welsh name as such. [noted -ed] However, Hopkins is not listed as Welsh here despite the fact that there are two major pockets for that name: in Ceredigion and in Gwent. The actor Anthony Hopkins is a case in point and so is the 1960s singer Mary Hopkin (no s on the end of her name). Other examples of -kin names with a significant presence in Wales are Jenkins and Watkins.