Jarek

Jarek is a boy's baby name of Slavic origin, a diminutive of Slavic names beginning with jar-, such as Jaroslav (famous glory) or Jaromir, from the Old Slavic jarъ, meaning 'spring' or 'vigorous,' and related roots meaning 'glory' or 'peace.'

Jarek is particularly common in Poland and the Czech Republic, where it functions as a friendly, informal short form of these longer Slavic classics. Outside Slavic-speaking countries it's a genuinely distinctive name — strong in sound, short in form, and with deep roots in a rich Slavic naming tradition that most Western parents have barely explored.