Fond du ___, Wis.

LAC

This Wisconsin city's name comes from French words meaning "bottom of the lake," reflecting its location at the southern end of Lake Winnebago.

This clue refers to the city Fond du Lac in Wisconsin, where "Lac" is the French word for "lake." The name translates to "bottom of the lake," reflecting the city’s location at the southern end of Lake Winnebago. Since crosswords often abbreviate place names, the answer is simply the last part, "LAC."