Mayor Marion Barry yesterday named Ann Kinney, a Ph.D. economist and one of his top campaign fund raisers, to oversee the city's economic development efforts.

The surprise appointment of Kinney "to coordinate development of a department of economic development" was announced by the mayor during a morning speech at a board of directors meeting of the Metropolitan Washington Board of Trade.

Kinney, who was in the audience but admitted she was unprepared for the announcement, said her job would be "to act as the point person for the administration" in organizing development efforts.

Kinney will be an executive assistant on the staff of the mayor and will not replace Knox Banner as director of the city's Business and Economic Development Agency.

A member of Barry's transition team that took office three months ago, Kinney worked as a full-time volunteer for the city council's finance and revenue committee-headed by Barry-before joining Barry's campaign staff.

In announcing her appointment Barry noted that he has doubled the size of the city economic development staff-from 8 to 17-and he said he would seek to double the budget of the office in his 1980 budget.

The new city economic development coordinator is married to Gilbert Kinney, administrator of the Archives of Art at the Smithsonion Institution. CAPTION: Picture, ANN KINNEY . . . economist, fund raiser