Analysis on each of the names, just because.
Prawnto - LOL clever. It fits the creature and fits the concept, which is good. The only thing I'm missing is the electric theme. I understand that it isn't necessary, but compared to other names like Krilowatt I find myself missing that element (...LOLpunsorry). 'Prawnto' sounds like something a Water-single type or Water-type with a lesser secondary type might be.
Jumbolt - I can see this name working on a very large electric-type creature, but unfortunately, the irony of the 'jumbo shrimp' phrase just doesn't translate into this name for me. :\
Overkrill - LOL. Punny and clever, yes, but sounds to me more like the name a hugely-powerful sweeper than that of a situational counter.
Krillumine - to me, this is the least smooth / most forced name of the ones listed... the combination of the two words just doesn't quite match up the best for me. That's all I really have to say on it, sorry. D:
Krilowatt - ...it's really hard to say what exactly it is about this one. I guess there's not much to explain. It's simple, it's clever, and it combines electricity with the shrimp as simply as the design does. No complaints or nitpicks, really, it just feels the best. *voted for*
Ebion - I still really like this one, but the feel of it is sort of like that of Jumbolt for me, just to a lesser extent. That is, it sounds like something potentially larger than our shrimpy Poke is. And then there's the pronounciational conundrum--is it Eb-ee-on or Eb-eye-on? I really appreciate the cultural references, but... Just not the best name for me. D:
Scurrint - I like this one because the enunciation feels like it should for a shrimpy utility counter... scurrent in, scurrent out, it's practically onomatepoeia, kahaha. xP I'd change the spelling, though, to Scurrent or Scurrunt. :0 ...actually I can't decide which. That's the biggest problem for me, is it doesn't know how it wants to be spelled. [/lamelogicsry]
I hate to put everyone else down, but I felt like I needed to justify why Krilowatt is the one that everyone is voting for to myself I guess. Congrats to those whose names were not-lame enough to make it to the poll, though. LOL