You should name your CV file (also commonly called a resume) “First-Name Surname – Resume.”
For example, “Celeste Barber – Resume.pdf” would be a good CV file name.
You can also include the job title you are applying for if you feel there will be lots of applicants, or if the organisation is large and could be recruiting for multiple positions – “First-Name Surname – Job Title – Resume.” For example, “Celeste Barber – Happiness Maker – Resume”