The name Loic originates from the Celtic Breton language spoken in the region of Brittany in northwestern France. It is derived from the ancient Breton word "loaïk" meaning "he who is bright or shining." The name is thought to have first appeared during the medieval period, around the 5th to 10th centuries.

One of the earliest recorded instances of the name Loic can be found in the writings of the Breton monk and scholar Gildas the Wise, who lived in the 6th century AD. In his work "De Excidio et Conquestu Britanniae," he mentions a Breton chieftain named Loic who fought against the invading Anglo-Saxons.

During the Middle Ages, the name Loic was relatively common among the Breton nobility and upper classes. One notable bearer of the name was Loic de Léon, a 12th-century Breton warlord who played a significant role in the conflict between the Dukes of Brittany and the French monarchy.

In the 16th century, the name gained popularity among French Huguenots (Protestants) who fled religious persecution and settled in various parts of Europe, including the Netherlands and England. One famous bearer of the name from this period was Loic de Castelfranc (c. 1520-1582), a French Protestant who became a prominent merchant and banker in Antwerp.

Another notable figure was Loic de Bretagne (1504-1558), a French nobleman and military commander who fought for the French king Francis I in the Italian Wars against the Holy Roman Empire and Spain.

In the 18th century, the name Loic was borne by Loic de Kergoumar (1734-1798), a French naval officer who served in the American Revolutionary War and later became a admiral in the French Navy.

While the name Loic has remained popular in Brittany and parts of France over the centuries, it has also been used in other cultures and languages, sometimes with slight variations in spelling or pronunciation, such as Loïc or Loeïc.