Smith remains the most common surname in the United States, according to a new analysis released yesterday by the Census Bureau. But for the first time, two Hispanic surnames — Garcia and Rodriguez — are among the top 10 most common in the nation, and Martinez nearly edged out Wilson for 10th place.

Garcia moved to No. 8 in 2000, up from No. 18, and Rodriguez jumped to No. 9 from 22nd place. The number of Hispanic surnames among the top 25 doubled, to 6.

Compiling the rankings is a cumbersome task, in part because of confidentiality and accuracy issues, according to the Census Bureau, and it is only the second time it has prepared such a list. While the historical record is sketchy, several demographers said it was probably the first time that any non-Anglo name was among the 10 most common in the nation.

Altogether, the census found six million surnames in the United States. Among those, 151,000 were shared by a hundred or more Americans. Four million were held by only one person.