There are - and have been -
many coronaviruses.
Here's how WebMd categorizes them:
Human Coronavirus Types
Scientists have divided coronaviruses into four sub-groupings, called alpha, beta, gamma, and delta. Seven of these viruses can infect people. The four common ones are:
229E (alpha)
NL63 (alpha)
OC43 (beta)
HKU1 (beta)
The three less-common ones are:
MERS-CoV, a beta virus that causes Middle East respiratory syndrome (MERS)
SARS-CoV, a beta virus that causes severe acute respiratory syndrome (SARS)
SARS-CoV-2, which causes COVID-19