Top 2:
Yippy-Skippy, the 3-lb. orange dead-blow hammer
Roger, the he/she button maker
Both tools acquired in the early 2000's; both tools long past their service lives; both tools still in use regardless.
(For the record, we've named pretty much every one of our tools at some point or another; the general idea is that if a name sticks, then the tool in question must actually be important enough to deserve a name.)