Many of you have been watching The Dig, the movie starring Ralph Fiennes and Carey Mulligan on Netflix about the Anglo-Saxon archeological discoveries in Sutton Hoo, Suffolk (the southern part of the bulgy bit on the eastern side of England).
You are probably thinking, "Yet another bizarre British place name!", although it cannot compete with my family's favourite when we were growing up not far from there: Six Mile Bottom.
OK, you can stop giggling now and let us apply ourselves to the place name in question.
"Hoo" has nothing to do with our pronoun "who". In very old Anglo-Saxon, hōh was the word for "heel". "hōh" gradually morphed into "heel" and by 1300 was not being used any more. But it survived in some place names, because hōh also meant "a projecting ridge of land shaped like a heel".