Trademark is translated by "marque déposée" in French
No. SARL stands for Société à responsabilité limitée, a type of company equivalent to a UK limited company (or Ltd), or (roughly) a privately held US corporation. A trademark is a type of intellectual property right.
"Frisbee" is Frisbee in French because Frisbee is a trademark name.
marque de fabrique
Velcro is a trademark, so like in most languages, you say "Velcro" in French.
"Baileys" in French is the same as "Baileys" in English : a trademark © R&A Bailey & Co. 2009
Wii is a trademark. Trademarks are the same in every language.
A biro is called "un stylo" in French. Many commonly say "un bic" (trademark).
A white board is 'un tableau blanc' or 'un tableau Velleda' (trademark) or 'un tableau effacable' in French.
The French equivalent of the name William is Guillaume.
a ballpoint pen is called "un stylo" or un "stylo-bille" in French. sometimes the trademark "Bic" is also used.
There is no French equivalent; the first name Isaac is used in French as well.
un tableau blanc, un tableau Vélleda (trademark)