I noticed from your example of the filing that 'fictious' was used to represent unknown people and
'fictitious' was used to represent unknown entities--as in a 'fictitious business license.
I don't know legal jargon, but perhaps it is intentional and refers back to people in the case of fictious, and businesses in the case of fictitious.
According to Merrian-Webster, Fictious is an adjective and means, "given to fiction". https://www.merriam-webster.com/dictionary/fictious
I noticed from your example of the filing that 'fictious' was used to represent unknown people and 'fictitious' was used to represent unknown entities--as in a 'fictitious business license.
I don't know legal jargon, but perhaps it is intentional and refers back to people in the case of fictious, and businesses in the case of fictitious.
Just my thoughts,
sounds to me like it’s covering characters playing a part. like Biden vs Bidan.