3nder, the kinky app catering to threesomes, will change its name amid a nasty trademark dispute.

Dogged by a lawsuit from Tinder filed this spring, British-based 3nder is expected to announce on Tuesday that it will change its name to “Feeld.”

As evidence that 3nder infringed on Tinder’s trademark, lawyers for the Los Angeles company, headed by Sean Rad, had cited an October 2015 story in The Post that quoted 3nder founder Dimo Trifonov as saying 3nder can be pronounced “Thrinder” to rhyme with “Tinder.”

On Tuesday, however, Trifonov is expected to say there were other reasons for the 2-year-old company to change its name.

“Early on, it was clear 3nder was more than just an app for threesomes,” said Trifonov. “Feeld is a place where people feel free to explore along their personal boundaries.”

Feeld has seen downloads grow 65 percent year-to-date compared with last year, to reach a total of 1.57 million.

With 600 matches an hour, members send 3 million messages a month, it said.