Holy Lance
The name of the soldier who pierced Christ's side with a "lonchē" is not given in the Gospel of John, but in the oldest known references to the legend, the apocryphal Gospel of Nicodemus appended to late manuscripts of the 4th century "Acts of Pilate", the soldier is identified as a centurion and called Longinus (making the spear's Latin name "Lancea Longini").
Longinus
The name is probably Latinized from the Greek "lonche" (λόγχη), the word used for the lance mentioned in John 19:34. It first appears lettered on an illumination of the Crucifixion beside the figure of the soldier holding a spear, written, perhaps contemporaneously, in horizontal Greek letters, , in the Syriac gospel manuscript illuminated by a certain Rabulas in the year 586, in the Laurentian Library, Florence. The spear used is known as the Holy Lance, and more recently, especially in occult circles, as the "Spear of Destiny", which was revered at Jerusalem by the sixth century, although neither the centurion nor the name "Longinus" were invoked in any surviving report. As the "Lance of Longinus", the spear figures in the legends of the Holy Grail.