organic chemistry - Naming of a Hydrocarbon with a Benzene Functional Group

What would the name of this hydrocarbon be?

I thought it might have been $\ce{3-phenyl-1-butene}$, however, after searching through a number of chemical websites, I found that 3-phenyl-1-butene isn't the correct name (the structures coming up had the benzene ring attached at the 4th carbon from the $\ce{C-C}$ double bond).