Well I am sure my company and HR have a title for me somewhere, but I work with networks mostly, everything I do on a daily basis is networking. I have two titles most people know me by: NetMage, and IntraNet Pyromaniac. The latter because I work in Test and QA a lot and break networks and network devices. Both are listed on different business cards, of which I have handed out maybe 10 on various trips for training other teams.

Pretty much I am self driven, and work on my own or in teams that know me well and just call me by my name. I have found that titles are mostly for fun, and for HR to be able to catagorize you into spreadsheets and slides nicely.

My Manager used to have the title "Pest Control" (again QA, finding bugs), and when she did that, the guy sitting in the office next to me took on the title "Pest"

Other titles I have seen: "Tall Blond Guy" because, well, he was! "Digital Entomologist", "Bug Hunter", etc.

As consultants and such, titles may be more important, working in the small or even large engineering teams that I work in, what you are working on is much more important to be known than a title.