surloin

from The Collaborative International Dictionary of English v.0.48

Sirloin \Sir"loin`\, n. [A corruption of surloin. Not so called
   because this cut of beef was once jocosely knighted (dubbed
   Sir Loin) by an English king, as according to a popular
   story.]
   A loin of beef, or a part of a loin. [Written also
   {surloin}.]
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Surloin \Sur"loin`\ (s[^u]r"loin`), n. [F. surlonge; sur upon +
   longe loin. See {Sur-}, and {Loin}.]
   A loin of beef, or the upper part of the loin. See {Sirloin},
   the more usual, but not etymologically preferable,
   orthography. [Also spelled {sirloin}.]
   [1913 Webster]

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