The character (張) per se is comprised of 弓 (gōng -- a bow used in warfare) and 长 (cháng or zhǎng -- "length" "long" or "to grow," though it is probably the latter that contributes to the notion of an expanding bow)
The origin of the surname Zhang is legendary. The fifth son of Huāng Dì (Emperor), the legendary supreme ancestor of all Han Chinese, was Qīng Yáng Shì (青阳氏). Qīng Yáng Shì's son Huī (挥) was inspired by the Chinese Arc Constellation -- Tiān Gōng Xīng (天弓星) in the sky and invented the bow. Later Hui was assigned as Gōng Zhèng (弓正), the minister in charge of observing the Arc Constellation and making bows. Then Hui and his descendants were bestowed the surname Zhang, which, if broken into its constituent radicals, would mean "the master of bows" in Chinese. It is believed that the ancestors of Zhang's were archers and the bow as a totem of their tribe.
                                                                                                ---Wikipedia---

Exclamation_popcorn reflected on life at 9:45 PM