Aach (toponymy)

Short description: Widespread Upper German hydronym

Aach (variants Ach, Ache; Aa) is a widespread Upper German hydronym, from an Old High German aha (Proto-Germanic *ahwō) "running water" (ultimately from PIE *hakʷā- "(moving) water"). The word has also been reduced to a frequent suffix -ach in Alemannic and Austro-Bavarian toponymy. The word is cognate with Old English ǣ (reflected in English placenames as -ea, also Yeo, Eau), Old Frisian ē, Old Saxon aha, Low Franconian Aa, Old Norse á, Gothic aƕa, all meaning "river; running water".

The Old High German contraction from -aha to -aa, -â in compound hydronyms present from an early time (early 9th century). The simplex noun aha remained uncontracted, however, and Old High German -aha (Modern German -ach) could be restituted in compounds at any time.[1]

Related is the German Aue (variant Au) with a meaning "river island, wetland, floodplain, riparian woodland", i.e. a cultivated landscape in a riparian zone. It is derived from the same root, but with a -yo- suffix (Proto-Germanic *awjō). This word was also reduced to a suffix, as -au (as in Reichenau). It is frequent as a river name, as in Große Aue, Aue (Elbe), Aue (Weser), etc., as well as the name of a settlement, as in Aue, Saxony; Au, St. Gallen; Au, Vorarlberg; Au am Rhein; Au am Leithaberge; etc.

The river-name Aach in Upper Germany is reserved for broad, but non-navigable, running streams with noticeable gradient sufficient to power water mills; it contrasts with Fluss used for navigable rivers on one hand, and with Bach for minor brooks or rivulets. An instructive example is Salzach, now classed as a Fluss ("river") but formerly as Ache as it was only navigable by raft, not by regular riverboats.

Hydronymy in -ach generally indicates a Germanic settlement in the early medieval or migration period, while names in -bach indicate names of the high medieval period.[2] In French, the Old Frankish form evolved into aix, as in Aix-en-Provence, Aix-les-Bains; the Italian reflex is -acco. Hydronyms in aar, ahr, acher reflect a cognate Celtic word.

## References

1. ↑ super fluuiolo Geazaha a. 782; inter Uuiseraa et Fuldaa a. 813; in pago Uuestracha a. 839. H. Menke, "Komposita auf -aha, -apa" in: Das Namengut der frühen karolingischen Königsurkunden (1980), p. 346. Discussion of the early contraction of aha > â: D. Schmidt, Die Namen der rechtsrheinischen Zuflüsse, 1970, 123-154.
2. ↑ Ute Maurnböck-Mosser, Die Haus- und Hofnamen im Gerichtsbezirk Mauerkirchen, 200, chapters "Die Bildung der Haus- und Hofnamen", "Grundwortverzeichnis"; ute.at

* Dieter Berger: Duden, Geographische Namen in Deutschland. Herkunft und Bedeutung der Namen von Ländern, Städten, Bergen und Gewässern, 2nd ed., Mannheim 1999, ISBN 3-411-06252-5
* Werner König: dtv-Atlas zur deutschen Sprache. Tafeln und Texte. 10th ed.. dtv-Atlas Nr. 3025, München 1994, ISBN 3-423-03025-9

## See also

* All pages with titles containing Aach
* All pages with titles containing Ache
* German toponymy
* List of early medieval watermills

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