I think most people call it SSL because they use OpenSSL library to deal with secure communication have SSL in their names. Openssl being the most dominant one). Other libraries are BoringSSL, LibreSSL, wolfSSL etc.
Libraries with TLS in their names are less frequently used
Libraries with TLS in their names are less frequently used
GnuTLS, mbedTLS, s2n-tls and RustTLS.