You have here a description of a colour placed upon another colour, which is bad heraldry. Usually a colour is placed upon a metal;or, a metal is placed upon a colour. This, is done for contrast. Perhaps you merely have the blazon wrong. The reason that etymologists are so vague about the etymology of Wyrick, is precisely because, it was originally Old High Prussian Weyrick. Consequently, there IS no Polish etymology. The crest (which is what is placed ABOVE the helmet, NOT upon the shield) is traditionally a golden coronet (or, open crown) with the crescent moon above--there is some controversy regarding the tincture of the crescent--id est, whether it is gold or silver--flanked by two swords, pointing upwards, leaning out at a 45 degree angle. This, may seem awkward or impractical for a mediaeval crest (though one may find worse). A knight actually wearing a coronet affixed to his helmet is no problem, nor would a device such as a carved or sculpted crescent moon affixed to the top of his helm be any encumbrance to him;however, two full-sized naked swords, points upward, affixed to either side of his helmet and, leaning out at a 45 degree angle to flank the crescent moon, would be a fatal mistake in an actual tournament. Such a crest would cost a knight his life. This traditional crest is a corrupt heraldic tradition. For indeed, this design was not orginally intended for a crest, to be affixed to the helmet, at all. It was taken from an ancient original design on the shield, of a human figure with its arms crossed upon its breast, holding a sword in each hand;so that, the swords naturally rose outward at a 45 degree angle, their points reaching just above where the crescent moon hovered above the coronet on the figure's head. There were two versions of this humaniform figure. Originally, in Old Prussia, it was that of a princess clothed in white samite, with long hair flowing unbound, seated upon a throne in the moonlight;and, naturally, the colour of the field was deepest azure. After their migration into Poland, the Wyricks became Wyrzyk;and, this figure of a Princess was altered to an allusion to the Mermaid of Warsaw though, of course, without the round shield she usually carries,having two swords instead of the usual one. The throne and the garment of white samite are dispensed with in this version of the arms. This, has been drawn as the Mermaid simply in a field of blue;or, as rising from the sea under a night sky. Some versions have included stars, to, accompany the Moon. There is a princess who was born a Wyrick and married a German Prince, who bears this ancient original design as a centre-shield upon her Husband's escutcheon, which is Per pale, dexter: sable a hound rampant or, its ears gules and, each ear charged with a saltyre argent;sinister: gules a swan rampant sagreant argent, crowned or, its beak and feet d'or.