The group's name, NewJeans, has two meanings. It alludes to the idea that jeans are a timeless fashion item and the group's intention to carve a timeless image for themselves. The name is also a word play on the phrase "new genes", referring to the group ushering a new generation of pop music.
NewJeans was selected by Korean fashion store Musinsa as their global brand ambassador, with the intention of expanding globally and targeting a young audience.
Three of the members became brand ambassadors for different luxury fashion houses: Hanni for Gucci, Hyein for Louis Vuitton, and Danielle for Burberry.
NewJeans has modeled for SK Telecom's "0(영, Young)" campaign, promoting the iPhone 14 Pro,
Shinhan Bank's "New Sol" campaign,
promoting the bank's mobile app Sol, Megastudy [ko]'s advertisement for their 2024 0 Won Mega Pass,
5252 by OiOi's pictorial for their signature down jacket,
and LG Electronics's commercial for their Gram laptop. In collaboration with both Musinsa and LG Electronics, the group released a limited edition of the laptop, the "LG Gram Style NewJeans Limited Edition Big Bunny", with gadgets inspired by NewJeans' concept. Outfits matching the laptop were available to customers who had made a reservation for LG Electronics's pop-up store, opened in Seongsu-dong, Seoul in January 2023 to promote the product.