According to Pokorny the English name 'Greyhound' does not mean 'grey dog/hound', but simply 'fair dog'. Subsequent words have been derived from the Proto-Indo-European root *g'her- 'shine, twinkle': English grey, Old High German gris 'grey, old,' Old Icelandic griss 'piglet, pig,' Old Icelandic gryja 'to dawn,' gryjandi 'morning twilight,' Old Irish grian 'sun,' Old Church Slavonic zorja 'morning twilight, brightness.' The common sense of these words is 'to shine; bright.'