 It was baptized the "Sierra", because at that time, Renault had not yet adopted its later scheme of designating each engine design with a letter.It was later that it took the name "Cléon", referring to the plant where it was made, combined with "Fonte" (meaning "cast-iron" in French) to distinguish it from the aluminum-block Renault 16 Cléon-Alu engine; it was later shortened to the "C engine.