All planets except for Earth got their names from the Roman Mythology.
Mercury : God’s Messenger (Winged God of Travel)
Venus : Goddess of Love
Mars : God of War
Jupiter : King of the Gods
Saturn : Father of Jupiter (also the God of Farming)
Uranus : God of the Heaven
Neptune : God of the Sea
The name Earth is of English/German origin and simply meaned “Grounded”
Isn’t this interesting?