No Slavic boy names start with the letter Q. This might surprise anyone scrolling through an alphabetical list of Slavic names, since almost every other letter fills up with entries. Q is the one letter that stays empty, and the reason has nothing to do with a lack of naming tradition. Slavic cultures have thousands of years of naming customs. The letter itself is simply missing from the picture.
The gap traces back to the alphabets that Slavic languages use. Languages written in Cyrillic, such as Russian, Ukrainian, Serbian, and Bulgarian, have no letter Q at all in their alphabet. Languages written in the Latin alphabet, such as Polish, Czech, Slovak, and Croatian, do include Q as a character, but only for spelling foreign words and modern loanwords. It never appears in native vocabulary or in names passed down through generations. On top of that, Slavic phonology does not use the “kw” sound the way English does. Where English spells that sound with “qu,” Slavic languages spell it with “kv” instead. A name that starts with Qu in Latin or English almost always shows up with a K or Kv at the front in a Slavic language.
This pattern shows up clearly in names borrowed from outside the Slavic world. The Latin name Quirinus becomes Kwiryn in Polish, and the Italian name Guido becomes Kvido in Czech. Both names keep the original sound close to intact, just respelled to fit Slavic spelling rules. These near-misses are the closest anyone gets to a Slavic boy name starting with Q, and they explain why the letter stays blank on this list.