The Cogan and Goggin coat of arms dates back to Milo de Cogan, one of the knights of Strongbow

Strongbow

The term Strongbow may refer to:*Richard de Clare, 2nd Earl of Pembroke, a Norman earl also known by the nickname "Strongbow"*Strongbow Cider*Beleg Cúthalion , a character in JRR Tolkien's Quenta Silmarillion...

, around 1154AD. The coat of arms are detailed below.

Details of Arms

The Goggin and Cogan Blazon of Arms comprises "Gules, three oak leaves argent"

- Gules

Gules

In heraldry, gules is the tincture with the colour red, and belongs to the class of dark tinctures called "colours". In engraving, it is sometimes depicted as a region of vertical lines or else marked with gu. as an abbreviation....

 being red indicates military resolution and magnanimity.

- Argent

Argent

In heraldry, argent is the tincture of silver, and belongs to the class of light tinctures, called "metals". It is very frequently depicted as white and usually considered interchangeable with it...

 represents the colours silver or white and indicates harmony and sincerity.
The Goggin family crest

Crest (heraldry)

A crest is a component of an heraldic display, so called because it stands on top of a helmet, as the crest of a jay stands on the bird's head....

is derived from that of Cogan"

Links

www.goggin.co.uk/coatofarms/coatofarms.htm