Word Blindness: H2Origin

I had a momentary attack of word blindness recently when subbing a news story about a Peugeot hydrogen fuel-cell van called the H2Origin. Obviously the name of this vehicle is a combination of 'H20' and 'Origin'; however looking it I could only think: "I know what H20 is, but what on earth's a rigin?'

The H20 rigin. I mean H2Origin.