I should now address the issue of terminology. What is a 'cello? What was a 'cello? What is a basse de violon, a basse de viole? I'm hoping to show some quotes which will tell that it depends partly on where you are and when.

J. G. Walther Preacepta der Musicalishen Composition Leipzig, 1708: The violoncello is an Italian instrument not unlike the viola da gamba, which is played almost like a violin. It is supported partly by the left hand, which stops the notes, and partly by being hung from a coat button because of its weight.

Sebastian Brossard, 1703: Violoncello, This is our Quinte de Violon or a little Basse de Violon with five or six strings.

Johann Mattheson, 1713: The excellent Violoncello, the Bassa Viola and Viola di Spala are small bass instruments (in comparison with the bigger ones) with 5 or 6 strings, on which one can play more easily fast notes and ornaments. It is held against the chest by means of a ribbon and is played on the right shoulder.

Leopold Mozart, 1756: Violoncello: It used to have 5 strings but is now played with only four.

J. Eisel, 1738: Violoncello, Bassa Viola, Viola da Spalla: we should throw all three into the same pot, since all three are small bass violins.

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These quotes are from Charles Medlam's recent book, 'Approaches to the Bach cello suites'.