"Variant of Ottilie"
The name Ottie is commonly a female name from the "Teutonic" origin.
Ottie is an English pet form of Ottilie, the German form of Odilia, formed with the diminutive suffix -ie that also appears in names such as Annie and Charlie. The same ending attaches to the male name Otto, of which Ottie is also a short form. The suffix is a form marker rather than a meaning, and no meaning is attached to Ottie itself.
Ottilie means "I will praise God, Praise to God; Wealthy, Little; One who lives in the valley. A feminine form of Odell.".
The pronunciation of Ottie is AH-tee.