sentences:  Other theories connect the town's name to occupational names relating to mud huts, iron tips for arrows and spears, or the production of tar ("pkielce", a settlement of tar makers).The most probable etymology traces the origins of the name to an Old Polish noun "kielce" (plural form of "kielec", "sprout") and refers to plants sprouting in the wetlands where the settlement was located.The earliest extant document referring to the settlement by the name of Kielce dates to 1213.