Boruto" (ボルト) is the Japanese pronunciation of the English word "bolt," as evidenced by the bolt he wears around his neck. His name is a reference to his cousin Neji, whose name means "screw" (捻子). It may also be a reference to his late paternal grandfather's famed Flying Thunder God Technique, as the kanji rai (雷) can be translated as "lightning bolt."
In his The Last: Naruto the Movie artwork, Boruto has lavender eyes instead of blue in the manga. It should be noted, however, that only Boruto's back is seen in the film itself, thus his actual eye color in the film is unknown.
Like his sister Himawari, Boruto's hair resembles the shape of a leaf.