Yes, in some cases verbal working memory deficits are associated with dysgraphia. Other deficits include retrieval fluency, motor planning, and of course, all the phonological and orthographic skills associated with decoding and encoding written language. Not every dysgraphic has deficits in every area, or in the same areas.

Deficits in working memory aren't always clear cut on the WISC-IV, especially when Arithmetic is used as one of the subtests, as math ability is a confound.

...pronounced like the long vowel and first letter of the alphabet...