Between 1951 and 1969 there were a number of similarly named drinks, including Cas-Si (blackcurrant), Ceri-Se (cherry) and Grapy (grapefruit). In 1969, the name Si si was changed to one word, Sisi.
From 1951 to 1969, there were drinks with names like Cas-Si (blackcurrant), Ceri-Se (cherry), and Grapy (grapefruit). In 1969, the name Si si was simplified to Sisi.