First off, the Wildlife and the Wrestling people never fought over a domain name. Because they both used "WWF" originally for different things, they had reached a contractual agreement as to what the parties could use those initials for. Because the Wrestling people eventually violated that agreement, they had to change their name to World Wrestling Entertainment - WWE. That had nothing to to with a domain name.
Later, well after the Wrestling people had abandoned the wwf.com domain name, the Wildlife people went after the domainer who had picked it up, not the Wrestling people:
https://www.wipo.int/amc/en/domains/decisions/html/2006/d2006-0975.html
WWF-World Wide Fund for Nature aka WWF International v. Moniker Online Services LLC and Gregory Ricks
Case No. D2006-0975
1. The Parties
The Complainant is WWF-World Wide Fund for Nature aka WWF International, (formerly World Wildlife Fund), Gland, Switzerland, represented by Edwin Coe, United Kingdom of Great Britain and Northern Ireland.
The Respondents are:
(i) Moniker Online Services LLC, Florida, United States of America; and
(ii) Gregory Ricks, Texas, United States of America, represented by John B. Berryhill, Ph.d. Esq., United States of America.
2. The Domain Name and Registrar
The disputed Domain Name <wwf.com> is registered with Moniker Online Services, LLC.
--------------
If you are interested generally in three-letter name cases:
<wbw.com>
https://www.adrforum.com/DomainDecisions/98813.htm
<eaa.com>
https://www.adrforum.com/DomainDecisions/206309.htm
<toh.com>
https://www.adrforum.com/DomainDecisions/651060.htm
<jdm.com>
https://www.wipo.int/amc/en/domains/search/text.jsp?case=D2017-1182
<tnp.com>
https://www.wipo.int/amc/en/domains/search/text.jsp?case=D2017-0669
<dky.com>
https://www.wipo.int/amc/en/domains/search/text.jsp?case=D2015-1757
<qlp.com>
https://www.wipo.int/amc/en/domains/search/case.jsp?case=D2013-1691
<usu.com>
https://www.wipo.int/amc/en/domains/decisions/html/2009/d2009-0761.html
<don.net>
https://www.wipo.int/amc/en/domains/decisions/html/2008/d2008-1373.html
<fcc.com>
https://www.wipo.int/amc/en/domains/decisions/html/2007/d2007-0770.html
I will award bonus points to the first person who figures out two things that all of those three-letter name cases have in common.