1. The development of the letter Kk

2. the Semitic origin of the letter
Old Egyptians used the open hand as a sign to represent the letter D as in the Egyptian word DRT, meaning hand.
Semites who lived in Egypt, adopted the sign of an open hand to represent the letter K as in the Semitic word “kap”.

3. The proto Semitic Kk

4. From phoenician to Greek
Later on, the sign of the letter came to the Greek (kappa) via Phoenician (kaph).
Phoenician Kaph:
The Greek Kappa:

5. From Greek to Latin
When Greek words were taken into Latin, the Kappa was changed into C.
In the early Latin, the letters C, K and Q were all used to represent the sound /k/.
Q was used to represent /k/ before a rounded vowel.
K before /a/, and C elsewhere.
Later, the use of C replaced most usages of K and Q. K survived only in a few fossilized forms.

6. Kk in modern English
Words with the /k/ sound came to English when already transliterated into C.
Today, English is the only Germanic language to use hard C in addition to K.
The wikipedia, defines Kk as the eleventh letter of of the basic modern Latin alphabet.
Its name in English is “kay”.
It is pronounced as /keɪ/.

7. Conclusion – letter formation
Egyptian Hieroglyph
Proto- Semitic Kk
Phoenician
Greek Kk
Latin alphabet

8. Conclusion – letter pronunciation
The letter is pronounced /k/.
This sound value came into English via Semitic.