Old English sæ meant "sheet of water, lake, pool." The meaning "dark area of the moon's surface." originates in the 17th century. I like the poetics hidden in the expression. The sea and the moon as eternal companions.
These little fellows are adorable monkeys indeed. At least that was the meaning of the word in the 17th century, and it also meant harlot for some time. Miniature dog came to use only in the mid 18th century.
Do you want to cast spells like Harry Potter? You don't even need a wand. All you need is proper grammar!