There is a long established convention of referring to the Supreme Court in a given era by the name of its Chief Justice. Thus, we have the Marshall Court, the Warren Court, and the Rehnquist Court. But this name is often a misnomer because the Chief was not the most influential member of his Court. Like all other justices, he always has but one vote. Particularly in the modern era, where political scientists can evaluate judges based on ideological scores, the better name for a Court might that of the swing or median Justice. Under this view, we are living currently in the era of the Kennedy Court.
But probably not for much longer. Justice Anthony Kennedy has announced to prospective clerks that he thinking of retiring. Moreover, as I have previously discussed, with rise of partisanship, justices now have every incentive to retire when both the Presidency and the Senate is under the control of the party whose President appointed them. Otherwise the Court may be left short-handed for an indefinite period and they may be replaced by justices of the opposite party when that alignment finally occurs. Kennedy cannot be confident that the Republicans will control the Senate after 2018.
Assuming that, as is likely, Kennedy is replaced by a justice with views like Neil Gorsuch, the Roberts Court will actually become the Roberts Court in more than name, because the Chief Justice will also become the median justice.