Oliver
The Name started phasing out of USA market in 1983. I had a 1985 Truck label as Nissan. Name change over complete by 1986.
Terrence B
Official worldwide would be 1986 model year. This happened a year or two earlier on some models, depending on the market.
https://en.wikipedia.org/wiki/Datsun
thebax2006
1974 was the last year they made Datsun 280z's. It was Nissan in 1984.
skeptik
1934.
To clarify - the name of the company since the early 30s was "Nissan." "Datsun" was a model name.
Nissan dropped the "Datsun" badge in 1986, though they revived it for sales in developing countries in 2013.
Scott
In 1986 they phased out that name in the USA.