Well, it comes from Lockhart (Tifa Lockhart) and I dunno, I was like 15 and thought it would be cool to make it Lockharted.
I've had variations, my PSN is Lockhearted - it kinda suits me I think, I like the connotations of a 'locked up heart' and stuff and I always feel a bit... Tifa-ey when I use it. I've never had it shortened before like I have on here - I love Locky, and I may possibly change it.... maybe! I think it's quite different and unusual whilst being memorable. I like it.