Sumon is an uncommon name with similarities to for example Simon - and is often mistaken for "summon" which means "to bring forth" in english. Suman means "Intelligent, Wise" and has Hindu/Sanskrit origins. Sumo is a japanese wrestling sports, and "sumon" in swedish means "The Sumo fighter".
There is also a Chrome Experiment game named Sumon - in which you need to practise your mathskills.
A semi-famous person calling himself "sumon" can be found online as an outstanding programmer from the community of Autohotkey scripters.
Sumon, you're smart, right? Let's play some Sumon!