noun
new customer; new client
Polite term used in business contexts, often with さん or 様 (e.g., ご新規さん, ご新規様). Refers to a first-time customer or client.
See also: 新規
今月はご新規様が10名いらっしゃいました。
We had ten new customers this month.
ご新規さんには初回割引があります。
There is a first-time discount for new customers.
新規 is a more general term for 'new' or 'newly established', while ご新規 specifically refers to a new customer in a polite manner.
Combination of the honorific prefix ご and 新規 (new, fresh). The exact historical derivation is uncertain, but it is a conventional polite expression for a new customer.