From the root of the above, by the prefix g, is formed Gael. and Welsh glas, blue or green, (perhaps originally rather transparent), and the Old Norse gladr, Old High Germ. glatt, shining.
| Scotland. | The Glass. Inverness. |
| Glass. A lake, Rosshire. | |
| Germany. | The Glatt. Hohenzollern Sig. |
| Switzerland. | Glata, 8th cent. The Glatt. |
Also from the same root come Gael., Ir., and Arm. glan, Welsh glain, pure, clear, Eng. clean.
| England. | The Glen. Northumberland. |
| The Glen. Lincolnshire. | |
| The Clun. Shropshire. | |
| France. | The Glane. |
| Germany. | Glana, 8th cent. The Glan, two rivers, and the Glon, three rivers. |
| Switzerland. | The Klön, a small but beautiful lake in the Klönthal—here, or to klein, little? |
| Italy. | Clanis ant., now the Chiana. |
| Clanius ant., in Campania. | |
| Illyria. | The Glan, in Carinthia. |
From the Old High Germ. hlutar, Mod. Germ. lauter, pure, Förstemann derives the following rivers of Germany. Hence also the name of Lauterbrunnen (brunnen, fountain), in Switzerland.
| Germany. | Hlutr(aha), 7th cent. The Lauter, the Luder, the Lutter. |
| The Sommerlauter in Wirtemberg seems to merit the title of pureness only in summer. |
The following names I think can hardly be referred to the same origin as the above, though according to Lhuyd, who derives them from Welsh gloew, clear, and dwr, water, they would have the same meaning.
| England. | The Lowther. Westmoreland. |
| Scotland. | The Lauder. Berwickshire. |
| France. | The Lauter. |
In the Gael. and Ir. ban, white, we may probably find the meaning of the following.