Aside from just sounding silly, does this actually make sense? Why wouldn't they just call him Padfoot? Or, say... Bob. If you overheard people talking about "Snuffles", wouldn't you be more likely to ask who that was, not less?

It also seems rather useless, as Sirius will in one of the later chapters (maybe even the next) sign his letter to Harry with 'Sirius'. The big dumbass.

Anyway, I'm glad we're getting more chapter reviews from you.