Etymology tree English congress Proto-Indo-European *mon- Proto-Germanic *mann- Proto-West Germanic *mann Old English mann Middle English man Middle English -man English -man English congressmanbor. Polish kongresman Proto-Indo-European *-keh₂der. Proto-Balto-Slavic *-kāˀ Proto-Slavic *-ъka Old Polish -ka Polish -ka Polish kongresmanka From kongresman + -ka.