The name reached its all-time peak in 2016 with 16 births ranking #1834. FALLING Recent data shows the name is currently falling.
Teddie is a familiar English short form of Edward or Theodore, and it can also be used as a feminine form. Its inherited meaning therefore depends on which longer name it comes from.
Like Teddy, Teddie has moved beyond nickname use into standalone use. The softer spelling gives it a more flexible modern feel, especially for girls.