It couldn't have been called anything else besides Enterprise. TPTB wanted a fresh start, a way to introduce Star Trek to an audience who wouldn't ordinarily do that. To have a show that screamed Star Trek to fans, while distancing itself enough from the previous 3 spin-offs to make new viewers curious. Enterprise was the perfect title to fit that approach. There are all sorts of arguments based on how the series didn't live up to that concept in the weeks following the Pilot. How arriving hot on the heels of Voyager and on the same channel, UPN undermined everything... and I'd have to conclude those are solid criticisms. Perhaps better aimed at Paramount though rather than Berman or Braga, because the Studio wanted a Star Trek replacement show there and then without allowing enough time for both the demand and creativity to build. Later of course, it became pretty obvious they'd changed their minds and didn't want the show to last... leaving fans who had given it a chance during two uncertain years and then convinced by the latter ones, to spend forever more having to continually justify their faith (pun intended).