There are multiple origins and meanings for the name:
1. Slavic name (Russian Лада) meaning - "harmonious, fine"
2. Derived from the Romanian word ladă meaning - "box, crate, coffer, trunk; chest"
Lada was a folkloric Slavic pagan deity of harmony, merriment, youth, love and beauty which almost certainly never existed in the ancient Slavic pantheon. It is perhaps the finest example of misconception, confusion or pure invention caused by romanticized or neo-pagan attempts at reconstruction of old Slavic mythology through unskilled or uncritical interpretations of Slavic folklore.