"Form of Trinity"
The name Trinitie is commonly a female name from the "English" origin.
Trinitie is a respelling of Trinity, the English word name taken from Latin trinitas, meaning threefoldness or triad. The -ie ending in place of -y matches a common pattern in American given-name spellings, as in Destinie for Destiny or Destinee. The spelling has no separate origin or meaning of its own; it carries the same derivation as Trinity.
Trinity means "Three".
The pronunciation of Trinitie is TRIN-ih-tee.