What does Douglas mean?
From Scottish Gaelic 'dubh glais' meaning 'dark stream' or 'dark water' (dubh 'dark' + glais 'stream, water'), originally a river name and clan surname.
What does Logan mean?
Logan is a Scottish surname and place name from the Gaelic lagan, “little hollow.” A surname turned first name, it has soared in recent decades for boys and, increasingly, girls.