Superman, Batman, and Max Mercury have all been cited as giving comic-book speedster Bart Allen the name Impulse. Batman most famously in Impulse #50, and Superman in the previews for All-Flash #1. (The final lettering simply said “He was code-named Impulse,” sidestepping the issue). But who named him originally?
The name first appears on the cover of Flash #93 (August 1994), with an out-of-control Bart Allen fighting the Flash. The cover is captioned, “Brash Impulse!” Over the next few issues, Wally West’s inner monologue refers to Bart as being impulsive, or (at one point) as “Mr. Impulse.”
It first appears on-panel as a name in Zero Hour #3 (September 1994), when Bart meets Superman for the first time, but Bart introduces himself as Impulse. Dan Jurgens writes.
Superman arrives in Keystone to see Velociraptors chasing Bart.
Superman: Dinosaurs from the merging timelines! Need a hand, kid?
Bart: Call me Kid Flash — and get your big “S” handed to you! The name’s Impulse!
After the events of Zero Hour, the name is explained in Flash v.2 #95 (November 1994), written by Mark Waid.
Wally and Bart are running through the city.
Wally: If we’re going to do this hero thing, let’s do it right. You need a code name.
Bart: How about “Kid Flash?”
Wally: Huh, well…
Bart: Pfffft! Just kidding. “Kid Flash.” Yeah, right…. Save yourself the brainpower. You already gave me a name. Repeatedly.
Bart stops and kisses a random woman on the street (yes, Bart).
Bart: I’m Impulse!
Wally: How terrifyingly accurate. And the mask?
Bart: Are you kiddin’ me? I saw so many guys wearing ’em, I just figured it was a law.
Fast forward several years.
(Thanks to Crazy Penguin for pointing this one out and scanning it) Secret Origins 80-Page Giant (December 1998) tells the origins of the members of Young Justice. In the Mark Waid–written Impulse story, the following exchange appears:
Carol: So who named you Impulse?
Bart: Batman. I have no idea why. Was he being funny?
Eight months later, Todd Dezago had just taken over as the third regular writer on Impulse. He started out with an unusual team-up in Impulse #50 (July 1999): Impulse and Batman against the Joker.
At the end of the issue, Impulse asks Batman a question:
Impulse: Wally said that you named me “Impulse”…what’s up with that?!
Batman: Wally misunderstood. I never meant for Impulse to be your name…. It was meant to be a warning.
Oddly enough, I don’t recall much complaining about the retcon.
Jump forward another half-decade, to the beginning of Bart’s brief career as the Flash. Danny Bilson and Paul Demeo have just taken over as series writers. A dream/origin sequence in Flash: The Fastest Man Alive #2 (September 2006) states, “It was Max who first dubbed me ‘Impulse.'” 
Fans across the Internet raged at this retcon, even asking about it at conventions, complaining about the “poor research.”
A year later, a 6-page preview of All-Flash #1 (September 2007) has Mark Waid back as writer. In it, Wally West thinks back on Bart’s life:
“The boy was flaky, unpredictable, and had the attention span of a bullet. Superman code-named him Impulse, and it was probably the first thing that ever stuck to him.”
The funny thing is, all that fans seemed to remember at the time about Impulse’s naming was Batman. Not the name he chose himself.
Countdown #43 reiterates the Batman version as Robin speaks at Bart’s funeral: “I remember it was Batman who first called him Impulse… and for a while, the name stuck. I never thought he’d take things seriously enough to be the Flash.”
Finally, in the published art for All-Flash #1, the wording has been altered from what was in the preview. It now simply says, “He was code-named Impulse,” rather than “Superman code-named him Impulse,” side-stepping the question entirely.
So in the final tally, we have 3 votes for Batman, 1 for Bart himself, and 1 for Max.
Part of me (the part that spent two years as an English Literature major) still thinks I should have titled this, “Today we Have Namings of Bart,” but I’m not sure how many people would get the reference.
Originally published at K-Squared Ramblings