There are (generally) two (2) rules for naming an LLC.
The name can’t be in use by (or be extremely similar to) another entity in the state; and
It needs to end with “LLC,” “L.L.C.,” “Limited Liability Company,” “Ltd. Liability Co.,” and so on.
The state in which it is formed may also consider certain words off-limits, such as “Bank,” City,” “Insurance,” and so on.
LLC Laws by State