Meaning and Name Origin
Trinity \t-rini-ty, tr(i)-nity\ as a girls' name is of Latin origin, and the meaning of Trinity is "triad". Refers to the Holy Trinity in Christian faith. Used mainly by Spanish-speaking families. Actress Trini Alvarado.
Trinity is a somewhat prominent first name for women (#2406 out of 4276, Top 56%) but an uncommon surname for both adults and children. (2000 U.S. Census)
Shown below is the birth name popularity of Trinity for girls. Trinity entered the list in 1993 and reached its apex rank of #48 in the U.S. in 2005, and is at #110 presently. (Top 1000 Birth Names Statistics, 2014)
Below is a graphed comparison of the usage of Trinity and associated names. Prominent variation forms of Trinity (#110 the previous year) are Trena and Trinidad. Adoption of these girl names reached its most widespread in the year 2005 and is almost as widespread today, but with the form Trinidad becoming less stylish. Trinity (#110) is the most chic girl name here. (Top 1000 Birth Names Statistics, 2014)