This in turn derives from the Proto-Indo-European root \* bhrgh meaning `` fortified elevation '' , with cognates including Welsh `` bera '' , `` stack '' and Sanskrit bhrant - `` high , elevated building '' . This in turn derives from the Proto-Indo-European root \* bhrgh meaning `` fortified elevation '' , with cognates including Welsh bera ( `` stack '' ) and Sanskrit bhrant - ( `` high , elevated building '' ) .