Ninna is a Scandinavian-derived given name, predominantly used in Nordic countries such as Denmark and Norway. It is considered to be a female form of the male name Ninn, which is derived from the Old Norse personal name Niðrúnr. Niðrúnr itself comes from two Old Norse elements: niður meaning 'down' or 'lower', and run 'secret'. Therefore, Ninna could be interpreted as meaning 'low-born secret' or 'the quiet one'. The name has been in use for centuries in Scandinavia but has not gained widespread popularity beyond these regions. It is often associated with Scandinavian culture and heritage.
"The name Ninna appears to have seen its peak popularity around the mid-90s with a notable dip in usage from 1997 to 2010 before experiencing a slight resurgence since 2013."