Waterhead

It is bounded to the southward by a line of springs or waterheads, which is also the northern boundary of the tract called the Terrai , one equally distinguished with the former from the souther plain country, but occasionally annexed to it and occasionally to the hills.

Source: wiktionary

Pukaki means a river source, the waterhead; so the name is literally descriptive.

Source: wiktionary

At the true waterhead, where the road from Hawkshead joins the road round the lake, used to stand the Old Waterhead Inn.

Source: wiktionary

In my Report on the Agriculture and Minerals of Derbyshire, the first volume of which, treating the surface, minerals, rivers, &c. is now in the press, An alphabetical List of the most remarkable Mountains, Hills and Eminences has been printed, referring to a small Map of 41 principal Ridges, or ranges of high ground, called waterheads, which divide the drainages to 32 rivers and rivulets , in and near Derbyshire.

Source: wiktionary