Andreus is of Greek origin and means "manly" or "courageous". It is derived from the Greek word 'andros', which signifies manhood or masculinity. The name gained popularity due to its use in ancient Roman culture, where it was often given to boys born into families who wished to emphasize their sons' strength and bravery. In some cases, Andreus may also be considered a variant of the name Andreas, which is a Greek name meaning "manly" or "victorious".
The name Andreus experienced significant fluctuations in popularity from 1980 to 2023, with peak years seeing up to three times the number of births compared to low years. The highest birth counts occurred relatively recently, with 22 births recorded in both 2007 and 2009, suggesting a possible resurgence in popularity for this name during the late 2000s and early 2010s. However, the total number of births for Andreus over this period (483) indicates that it has never been one of the most common names given to newborn boys.