What does the word guitar originates?

1620s, ultimately from Gk. kithara "cithara," a stringed musical instrument related to the lyre, perhaps from Pers. sihtar (see sitar); the name reached English several times, including early 14c. giterne, in reference to various stringed, guitar-like instruments; the modern word is directly from Sp. guittara, from Arabic qitar, from the Greek.