It was named after Robert Hobart, 4th Earl of Buckinghamshire, the Lord Hobart - secretary of state under George III. Hobart is named after Robert Hobart the general secretary under king George the 3rd.
"your name is" is correct English and when used in this way means both your full name or a part of your name (usually surname, depending on the context). "your names are" is also correct English, but...