Tonda is of Italian origin and means 'round' or 'sphere'. It's often used as a given name, particularly in Italy.
"The name Tonda experienced significant fluctuations in popularity over the years, peaking in 1961 with 117 births and dwindling to single digits by the late 1970s, reaching as low as 7 births in 1986. Over the entire period from 1942 to 1989, a total of 2426 babies were named Tonda."