See also here: https://chess.stackexchange.com/questions/46857/sicilian-defense-marshall-gambit-does-lichess-classify-this-correctly

The move order 1. e4 c5 2. Nc3 e6 3. d4 d5 is called Sicilian Defense: Marshall Gambit, but should probably be French Defense: Marshall Gambit.

The affected line is here: https://github.com/hayatbiralem/eco.json/blob/master/ecoC.json#L2255