- Stork (dialectal, otherwise obsolete)
From Middle High German storch, storc, from Old High German storah, *storc(h), from Proto-Germanic *sturkaz. Cognate to dialectal Dutch stork, English stork, Swedish stork. The expected German form is also Stork, which was indeed in wide use, but has not become standardized. The shifted variant Storch is probably due to the use of epenthetic vowels in Old High German, by which the uninflected stem storah alternated with inflected storc-. Such variation was generally levelled in favour of the inflected stem, but this was an apparent exception. Compare for the regular development Old High German starah alongside starc(h), whence Middle High German starc and modern stark. Alternatively, Storch could be an Upper German relict form (with [rx] from [rkx]), but the regional distribution does not seem to confirm this.
- Storch in Duden online
Storch m (plural Storchen)