Is it possible to create own subdomains in github pages?

[SAMALAMA37]

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For example: subdomain.example.github.io

[airtower-luna]

Simple answer: No. You get the github.io subdomain for your user/organization name automatically, the alternative is to use custom domain(s).

[AvverbioPronome]

No, as that would be a real mess for both DNS and TLS certificate Subject Alternative Names.

Both have wildcards, but wildcards do not apply to multiple labels. The current certificate is valid for *.github.io, meaning that it is valid for example.github.io but not valid for hello.example.github.io