The name Trinity has its origins in the Christian concept of the Holy Trinity, which is the belief in a single God existing as three distinct, co-equal persons: the Father, the Son, and the Holy Spirit. The name is derived from the Latin word "trinitas," meaning "triad" or "three-in-one."

The concept of the Trinity has been a central tenet of Christianity since its early days, and the name Trinity has been used to honor this doctrine. One of the earliest recorded uses of the name Trinity can be found in the writings of the early Church Fathers, such as Tertullian (c. 155-240 AD) and Origen (c. 184-253 AD), who discussed and defended the doctrine of the Trinity.

In medieval times, the name Trinity gained popularity as a female name, particularly among Christian communities. It was often given to girls born on Trinity Sunday, which is celebrated eight weeks after Easter and commemorates the doctrine of the Holy Trinity.

One of the earliest known bearers of the name Trinity was Trinity Ames (c. 1580-1636), an English writer and Puritan activist who published works on religious subjects. Another notable figure was Trinity Minns (c. 1608-1637), a servant who was executed for theft in London during the reign of King Charles I.

In the 18th century, the name Trinity was associated with the renowned British mathematician and philosopher, Trinity Hicks (1718-1799). She made significant contributions to the field of mathematics and was one of the first women to be admitted to the Royal Society in London.

During the 19th century, the name gained further recognition with Trinity Audax (1828-1908), a French writer and activist who advocated for women's rights and social reform. Another notable figure was Trinity Muir (1841-1915), a Scottish nurse and philanthropist who established several hospitals and nursing homes.

In more recent times, the name Trinity has been carried by Trinity Shaw (1906-1993), an American actress and singer who appeared in numerous Broadway productions, and Trinity Kuo (1952-2022), a Taiwanese politician and human rights activist who fought against authoritarianism and played a pivotal role in Taiwan's democratic transition.