The Thracian river name krisos
Word krisos
Meaning river name
See also Proto-Indo-European: *kers- ‘black’

Other words that might be of interest
achel- ‘water’, ala ‘current, stream’, alta ‘current, stream’, arma ‘swamp’, ars ‘to flow’, arta(s) ‘river’, e(i)b ‘to flow’, iuras ‘water, river’, kaba(s) ‘bog, swamp’, kalsas ‘dry, dried up’, mar ‘water, river, bog’, ostas ‘river mouth’, pala ‘swamp’, sara ‘river’, sind(u)- ‘river’, strumon ‘river’, opa ‘water’