Krysiak is a Polish-language surname. It is a patronymic surname of Northern Poland origin Język polski, Volumes 46-47, p. 86 formed by the addition of the diminutive suffix "-ak" to the diminutive form Kryś of father's first name Krzysztof (Christopher) or Krystian (Christian).Dictionary of American Family Names, 2013, Oxford University Press, as cited by ancestry.com
Notable people with this surname include:
Artur Krysiak (born 1989), Polish footballer Carolyn J. Krysiak (born 1939), American politician (1912–1944), Polish World War II underground fighter Wojciech Krysiak (born 1998), Polish gymnast
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