Origen of the letter:
From the Latin I which came from the Greek iota
Example of usage:
The I in Spanish
The letter I is the ninth letter and the third vowel in the Spanish, Greek and Roman alphabets. The Greeks called it iota, based on its Semitic name yodh, which means “hand”. It comes from the form the sign had in the Egyptian hieratic alphabet, which resembles a hand with a stretched open thumb. The dot over the lower case i entered general usage in the 11th century.
The dot was originally an accent that first signified a long vowel and later was used to differentiate the double i used to write the u, and to mark the letter in the combinations iu and ui.