Hi, Aviem,
I did a quick in trademarkia[1], and found a lot of  trademarks about
`rainbow`.

[1] https://www.trademarkia.com/trademarks-search.aspx?tn=rainbow

Thanks,
Ming Wen, Apache APISIX & Apache SkyWalking
Twitter: _WenMing


Aviem Zur <aviem...@apache.org> 于2020年5月4日周一 下午1:41写道:

> Not sure what legally needs to be checked, but a quick search on uspto.gov
> did not return any result of the single word 'rainbow':
>
>
> http://tmsearch.uspto.gov/bin/showfield?f=toc&state=4805%3A82m03t.1.1&p_search=searchss&p_L=50&BackReference=&p_plural=yes&p_s_PARA1=&p_tagrepl%7E%3A=PARA1%24LD&expr=PARA1+AND+PARA2&p_s_PARA2=rainbow&p_tagrepl%7E%3A=PARA2%24COMB&p_op_ALL=AND&a_default=search&a_search=Submit+Query&a_search=Submit+Query
>
> On Sun, May 3, 2020 at 2:00 PM Justin Mclean <jus...@classsoftware.com>
> wrote:
>
> > Hi,
> >
> > > We have conducted a name search for 'Rainbow'. We feel that although
> > there
> > > are few existing open source projects with this name, they are in a
> > > different space, hence not necessarily restrict us from using it.
> >
> > Did you look at existing trademarks?
> >
> > Thanks,
> > Justin
> >
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