Why the name of the processor called 8086?

The 8085 microprocessor was an enhanced version of the 8080, primarily running on a single +5V power supply, hence the designation 8085.

The 8086 microprocessor was an enhanced version of the 8085, primarily running as a 16 bit processor, hence the designation 8086.

The 8088 microprocessor (part of the 8086/8088 family) was a version of the 8086 that run on an 8 bit bus, hence the designation 8088.