Casper (with the same sounding Kasper) is a family and personal name derived from Aramaic that means "Treasurer".
The name is derived from Gaspar which in turn is from an ancient Chaldean word, "gizbar", which according to Strong's Concordance means "treasurer".
the Septuagint gave a Greek translation of "gizbar" in Ezra 1:8 as "gasbarinou" (literally, "son of Gasbar").
There are numerous modern variations such as Gaspar (Catalan, Portuguese and Spanish), Gaspare (Italian), Gaspard (French), Kaspar (Dutch, German), Kašpar (Czech), Casper (Dutch, English), Caspar (Dutch), Kacper (Polish), Kasperi (Finnish), Kasper (Danish, Swedish), Gáspár (Hungarian), Гаспар (Russian) and Kaspars (Latvian).
By the 6th century, the name "Gaspar" was recorded in mosaic at the Basilica of Sant'Apollinare Nuovo in Ravenna, Italy as one of the traditional names assigned by folklore to the anonymous Magi mentioned in the Gospel of Matthew account of the Nativity of Jesus.