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There are many manuscripts and early printed seforim in which this name appears and there is a " in between the kof and tzadi. This clearly indicates that it is an acronym. One source is the seforim of the Shach, in which, although he is commonly (currently) known by the last name Katz, he is called "Kohein Tzedek. Then look here. Notice that only 9 years later Kohein Tzedek has become Katz. The Salonika print is in Tav Kuf Samech Alef (5561 or 1801) and the Lvov print is in Tav Kuf Ayin (5570 or 1810.)

[This answer is adapted from my comments on this answerthis answer to another question. Thank you Ariel for the easy link!]

There are many manuscripts and early printed seforim in which this name appears and there is a " in between the kof and tzadi. This clearly indicates that it is an acronym. One source is the seforim of the Shach, in which, although he is commonly (currently) known by the last name Katz, he is called "Kohein Tzedek. Then look here. Notice that only 9 years later Kohein Tzedek has become Katz. The Salonika print is in Tav Kuf Samech Alef (5561 or 1801) and the Lvov print is in Tav Kuf Ayin (5570 or 1810.)

[This answer is adapted from my comments on this answer to another question. Thank you Ariel for the easy link!]

There are many manuscripts and early printed seforim in which this name appears and there is a " in between the kof and tzadi. This clearly indicates that it is an acronym. One source is the seforim of the Shach, in which, although he is commonly (currently) known by the last name Katz, he is called "Kohein Tzedek. Then look here. Notice that only 9 years later Kohein Tzedek has become Katz. The Salonika print is in Tav Kuf Samech Alef (5561 or 1801) and the Lvov print is in Tav Kuf Ayin (5570 or 1810.)

[This answer is adapted from my comments on this answer to another question. Thank you Ariel for the easy link!]

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source | link

There are many manuscripts and early printed seforim in which this name appears and there is a " in between the kof and tzadi. This clearly indicates that it is an acronym. One source is the seforim of the Shach, in which, although he is commonly (currently) known by the last name Katz, he is called "Kohein Tzedek. Then look here. Notice that only 9 years later Kohein Tzedek has become Katz. The Salonika print is in Tav Kuf Samech Alef (5561 or 1801) and the Lvov print is in Tav Kuf Ayin (5570 or 1810.)

[This answer is adapted from my comments on this answer to another question. Thank you Ariel for the easy link!]