CHICAGO, June 8 (Reuters) - A recent jump in yields on U.S. long-term Treasury debt mostly reflects more confidence in the economic outlook, New York Federal Reserve President William Dudley said on Monday.

In comments to Dow Jones Newswires and the Wall Street Journal, Dudley said higher yields could also reflect more nervousness among investors about the inflation outlook.

Ten-year Treasury note yields US10YT=RR traded as high as 3.90 percent on Monday, and are up from about 3.08 percent in mid-May.

Some economists worry that a rise in mortgage interest rates, which key off Treasury yields, could delay the hoped-for recovery in the U.S. housing market and the economy in general.

Dudley said there was "no magic rate" that the Fed was targeting for mortgages.

(Reporting by Ros Krasny; Editing by Diane Craft)