I assume you are speaking of something like this
Brian O-Connor
Brian O Connor
Either can go first, but if you're working for a company, I suggest you check with them.
There are not really many animals with a hyphenated name. A few animals with the hyphenated names are the prairie-dog, jack-rabbit, and the ground-squirrel.
In APA format, hyphenated names should be treated as one unit with no spaces. For in-text citations, use the full hyphenated name (e.g., Smith-Jones) each time the author is cited. In the reference list, list the hyphenated name as you would a single last name (e.g., Smith-Jones, A.).
Hyphenated things cannot be separated. The two go together.
When referring to the rank and file as a noun, no. For example: "The rank and file defied union leadership." However when used as an adjective or a modifier, then yes. "He needs rank-and-file support."
File Name
Yes a person can use a hyphenated surname (last name) which would be the woman's maiden name hyphenated with her married name. Example: Jane Doe-Smith. Often famous people or people known by their surname in a business they are running will keep their family name hyphenated with whomever they marry, but keep both the maiden surname and married surname is becoming more common practice. In ways keeping both names comes in handy if one is into genealogy.
a connected word ( or a hyphenated word)
Yes they are.
It is not hyphenated.
File name
Antisemitism. Sometimes it is hyphenated.
No it's not hyphenated.