Like many Argentinians it is Italian in origin but as they all speak Spanish (and in his case no English) then I would guess at Pochettino. It would appear to be a diminutive if 'pochette' which would mean 'little handbag'
Thanks, Nigel. Take the money and walk away with your head held high. You will forever be a legend here for what you have achieved and I doubt we'll see your type again.