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Last name origins & meanings:

1. German: habitational name from a place called Wacken near Itzehoe.
2. German: variant of Waack 1.
3. French: perhaps derived from an old Flemish word wacque, a measure of weight (Middle Dutch wage ‘weight’), hence an occupational name for an official responsible for weighing produce (in particular produce paid as rent in kind), or else for one who was in charge of checking weights and measures used by merchants in a market.