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In page Paddy field:

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Today, many family names have ta as a component, a practice which can be largely attributed to a government edict in the early Meiji Period which required all citizens to have a family name. Many chose a name based on some geographical feature associated with their residence or occupation, and as nearly three-fourths of the population were farmers, many made family names using ta. Some common examples are Tanaka (田中), literally meaning "in the paddy field;" Nakata (中田), "middle paddy field;" Kawada (川田), "river paddy field;" and Furuta (古田), "old paddy field."[citation needed]