NIST standardized 5 elliptic curves (P-192, P-224, P-256, P-384, P-521) for prime fields. When I looked into openssl, these curves are named as prime192v1, secp224r1, prime256v1, secp384r1, secp521r1. Is there any reason why the name convention was different for different curves?
The good thing about standards is that there are so many to choose from.
The P-192, P-224, P-256, P-384 and P-521 names come from the FIPS DSS (Latest version of which is FIPS 186-4):
The secp224r1, secp384r1 and secp521r1 names come from SEC2:
The prime192v1 and prime256v1 names come from RFC3279:
They're all the same curves though.