From wikipedia:

Later on, the organistrum was made smaller to let a single player both turn the crank and work the keys. The solo organistrum was known from Spain and France, but was largely replaced by the symphonia, a small box-shaped version of the hurdy-gurdy with three strings and a diatonic keyboard.

In the eighteenth century, the term hurdy-gurdy was also applied to a small, portable barrel organ or street organ (a cranked box instrument with a number of organ pipes, a bellows and a barrel with pins that rotated and programmed the tunes) that was frequently played by poor buskers, street musicians specifically called organ grinders.

According to the Oxford English Dictionary, the mid 18th century origin of the term hurdy-gurdy is onomatopoeic in origin, after the repetitive warble in pitch that characterizes instruments with solid wooden wheels that have warped due to changes in humidity or after the sound of the buzzing-bridge.[11] Alternately, the term is thought to come from the Scottish and northern English term for uproar or disorder, hirdy-girdy[7]:41 or from hurly-burly,[7]:40 an old English term for noise or commotion. The instrument is sometimes more descriptively called a wheel fiddle in English, but this term is rarely used among players of the instrument. Another possible derivation is from the Hungarian "hegedűs" (Slovenian variant "hrgadus") meaning a fiddle.[12] In France, the instrument is known as vielle à roue (wheel fiddle)