In American Sign Language you fingerspell it
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In American Sign Language, the name "Jillian" can be fingerspelled by using the ASL alphabet to spell out each letter of the name - J-I-L-L-I-A-N.
In American Sign Language (ASL), you can sign "Jillian" by fingerspelling each letter of the name using the ASL alphabet.
A person who does sign language is called a "sign language interpreter" if they are interpreting between spoken language and sign language, or a "sign language user" if they communicate primarily through sign language.
I don't know of any Irish language 'equivalent' of Jillian.
Anyone can learn sign language, but sign language is mostly associated with deaf and hard of hearing people which is their native language. (Although quite a few don't know sign language and learned language via oralism method.)
You can't speak sign language but you can "sign".