US 50 States' names are, in alphabetical Order
Two word State names only:
9/50 US States have 2 names. 41/50 US States have one name
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40 of the 50 states have one-word names. The ones that have two words are : New Hampshire, New Jersey, New Mexico, New York, North and South Carolina, North and South Dakota, West Virginia, and Rhode Island.
I assume you're asking about their common names. 41/50 of the states have one-word common names. Officially, many one-word states have longer names, like the Commonwealth of Pennsylvania or the State of Rhode Island and Providence Plantations.