What does Henegestus mean in Latin?

Henegestus, a proper noun, means “a male given name, equivalent to English Hengist”.

What is the genitive of Henegestus?

The genitive singular is Henegestī. Henegestus is masculine, second declension.

proper noun · masculinesecond declension

Henegestus m sg (genitive Henegestī)

Medieval Latinmasculinesingulara male given name, equivalent to English Hengist
Factum est autem post mortem guorthemeri filii regis guorthegirni henegesto confortato et ad se multis iterum navibus congregatis(Can we date this quote?), Nennius, Historia Brittonum: