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I would say, if we ignore the canon couples (Suefin, Gerita) the most shipped pair would be Spamano (Spain x S. Italy/Romano). I say this over FrUk or UsUk because they're actually a really common background couple, and while they don't have the most Fics or artwork about them they're less in the middle of flame wars and appear quite often, or at least hinted about leading me to believe they're the most popular ship, even though they aren't in the limelight as much as others (Saying so, they're actually pretty popular, so don't think they're uncommon.). There is practically no debate over this couple, or arguments about other Otp's conflicting either and when either if them are in a different pairing there usually is a reason given to why they aren't together.