约翰 is the standard Mandarin transliteration of 'John' (preserving the German/Latin /j/ rather than English /dʒ/), and
肯尼迪 is the family name Kennedy. JFK's most-quoted line
不要问国家能为你做什么，
要问你能为国家做什么 ('Ask not what your country can do for you...') is well known to Chinese learners as a textbook example of rhetorical inversion.
