NeXT, as means to bring C++ software into NeXTSTEP.
And just not to be a random dude in the Internet, here are the NeXT documents straight out of 1993, page 173.
http://www.bitsavers.org/pdf/next/Release_3_Nov93/Object-Ori...
Page 31 on "Developing business applications with OpenStep"
https://archive.org/details/developingbusine00gerv/page/n7/m...
Finally, from the language authors themselves, chapter 15, Objective-C++ (1989-1990)
"The Origins of Objective-C at PPI/Stepstone and Its Evolution at NeXT"