Apparently not;
Both that phrase and the accent that goes with it are strictly Hollywood. They originated with Robert Newton, the actor who played Long John Silver in the movies and on TV through much of the 1950s. Newton was from Dorset, in the Cotswolds district of southwest England, and the regional accent he brought to the movies included a rolled "r." - Slate
Did Pirates Really Say "Arrrr"? - Slate
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