Can I get a SSL certificate for my domain name from Apple
No, Apple does not issue SSL/TLS certificates for web hosting purposes. Apple's developer certificates are for code signing only.

LetsEncrypt and Caddy Server

LetsEncrypt provide free SSL/TLS certificates for use with your web site.

To ease the management your web site, consider Caddy for your web server. Caddy handles the certificate provisioning and renewal for you.

For non-commercial use, StartSSL, also offer free certificates.