In wikipedia's *[Casuarinaceae](http://en.wikipedia.org/wiki/Casuarinaceae)* article (and somewhat similarly in its *[Casuarina](http://en.wikipedia.org/wiki/Casuarina)* article), one finds:

> 
> The most widely used common name for Casuarinaceae species is sheoak or she-oak (a comparison of the timber quality with English Oak). Other common names include ironwood, bull-oak or buloke, and beefwood ... [Cox & Freeland say] the name 'she-oak' is derived from Native America *sheac* - beefwood.
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Unfortunately [etymonline](http://www.etymonline.com/) shows nothing on the etymology of *sheac, sheoak, she-oak, ironwood, bull-oak, buloke,* or *beefwood*.

Questions: What are the actual origin and history of the name *she oak* or *sheoak*? How is "a comparison of the timber quality with English Oak" relevant to the name? Was there actually a "Native American" influence in forming the name of an Australian tree? And for extra points, explain why the [Ngarrindjeri](http://en.wikipedia.org/wiki/Ngarrindjeri) have a separate word, *[kula](http://en.wiktionary.org/wiki/kula?rdfrom=Kula#Ngarrindjeri)*, for male she oak trees.