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It doesn't explicitly say it, but the latter half of this rule would encompass what you're talking about because it specifically says that person's surname:
"Rule 9.2 Numbers - Each player and each goalkeeper listed in the line-up of each team shall wear an individual identifying number at least ten inches (10'') high on the back of his sweater. Sweater numbers such as 00, ½ (fractions), .05 (decimals), 101 (three digit) are not permitted. In addition, each player and goalkeeper shall wear his surname in full, in block letters three inches (3'') high, across the back of his sweater at shoulder height."
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