WASHINGTON — The spreading expectation that President Obama will name Lawrence H. Summers to lead the Federal Reserve Board appears to be working against the central bank’s efforts to stimulate the economy.

The jitters even have some analysts betting that a Summers nomination could lead to slower economic growth, less job creation and higher interest rates than if the president named Janet L. Yellen, the Fed’s vice chairwoman.

Businesses raising money and people buying homes and cars all have faced higher interest rates in recent months as the Fed’s campaign to suppress borrowing costs has faltered. The rise in rates reflects optimism that the economy is gaining strength, and an expectation that the Fed will begin to pull back later this year. But a wide range of financial analysts also see evidence of a Summers effect.

Many investors expected that Ms. Yellen would be nominated to replace Ben S. Bernanke as head of the central bank, a choice that would have sent a clear message of continuity. Instead, investors are now trying to anticipate how Mr. Summers might change the Fed.