Here are some links to a few of the 26 NPC sorority national websites:
https://www.zetataualpha.org/cms400min/Default.aspx
https://www.pibetaphi.org/pibetaphi/
https://www.alphadeltapi.org/
https://www.deltagamma.org/
http://www.tridelta.org/
https://www.alphachiomega.org/
https://www.alphaphi.org/Home
https://www.alphagammadelta.org/Home
And the link to the National Panhellenic Conference, where you can find the names of all 26 member sororities,:
https://www.npcwomen.org/index.aspx
These are just some of the 26 National Panhellenic sororities. You should visit all their pages. They all do good work, have good values and offer sisterhood to many women. Please do not copy any of these groups names, colors, symbols, etc. Make your sorority your own-not a copy of an already existing one.