The Sydney Harbour ferry recently named Ferry McFerryface has bizarrely become a NSW election issue.

Maritime Union of Australia workers are boycotting the ferry over what they say is a "disrespectful" name and now Opposition Leader Luke Foley says he'll scrap the name if Labor wins government in early 2019.

"If Labor's elected to form the next government in NSW I will dump this silly name," Mr Foley said in a statement on Friday.

"We will rename the ferry and we will engage with the public to find a suitable name which recognises a prominent Australian."