Yes they are used commercially.

CFB Software, an Australian company, exists since 1997 selling Oberon compilers for ARM Cortex-M3, Cortex-M4, Cortex-M7 Microcontrollers and Xilinx FPGA Systems.

http://www.astrobe.com/default.htm

Systems programming language with GC support, running on tiny device boards.

Some time ago I applied for a job at a company that makes UAVs with combustion engines. They had Oberon on the "nice to have" list of skills they were expecting from applicants.

Oberon is more academic in nature. In the past some applications built with Oberon/F were commercially used. Oberon was one of the influences of the Go language.