According to the 1990 US Census, the most common last name was Smith (2.7 million people had this as their last name).
Sources:
http://genealogy.about.com/library/weekly/aa_common_surnames.htm
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The most common last name in the English language is "Smith". It is of Anglo-Saxon origin and has been a popular surname for centuries.
The most common language spoken in Mississippi is English.
The most common vowel in the English language is the letter "e."
English is the most common language spoken in Alaska.
The most common syllables in the English language are "un," "ing," and "tion."
The most common vowels in the English language are "a," "e," "i," "o," and "u."