Proto-IE: *sAk-
Meaning: a k. of marsh plant (sedge)
Celtic: *se(k)skā 'segde, reed' > Ir seisg `Binse'; Cymr hesg, sg. hesgen `carex', OCorn heschen `canna, arundo', Bret hesk `Schwentel od. Schilf mit schneidenden Blättern'
Russ. meaning: растение (осока)
References: WP II 474 f