"Dokin kogi" ba kalmar da aka saba amfani da ita ba ce a cikin Ingilishi kuma ƙila ba ta da ma'anar ƙamus na hukuma. Duk da haka, "kogi" yana nufin ruwa mai girma na halitta wanda ke tafiya a cikin ƙasa kuma "doki" yana nufin dabbar dabba mai ƙafa huɗu, mai kofato da aka yi amfani da ita don hawa, tsere, ko aikin gona.In wasu mahallin, "dokin kogi" na iya nufin hippopotamus, babban dabbar dabbar ciyawa da ke shafe mafi yawan lokutansa a cikin ruwa kuma ana samunsa a cikin koguna da tafkuna da yawa a yankin kudu da hamadar Sahara.