Branding is extremely important.

There is a number of different aspects to branding that need to be considered.

People have to be able to spell your domain, so the simplier the better. However you also want keywords, but in a short name.

You want your brand to stick out. So its fine you want to focus on personal branding. You could buy all the domains.

so www.johnsmith.com
www.jsmith,
wwwj.johns.com

and so on, and have them all run to your main account - if its your personal brand your main website should be your full name (have you considered changing your name?

As it needs to be uniform across all social and links, so if i google johnsmith you would want to be found (yes i understand the irony in using "john smith" as my example.

So really since its branding the Full Name is the only real option.

I can teach you everything you need to know about creating your own personal brand and can lead in you in the right direction on how you can achieve your branding and marketing goals.