It's a reference to a rather mysterious phrase used by several painters

Many articles are written about the mysterious phrase. They try to explain the origin of the words or what the phrase is specifically meant to express. Written in Latin, the words ‘Et in Arcadia Ego’ roughly translate to ‘even in Arcadia I’ or ‘And in Arcadia I go’. Because of the phrase’s seemingly unfinished thought and the scene in which it is part of, many consider the conveyance of the words to be ‘that even in Arcadia (paradise) death is inevitable’; that time did not allow for a completion.

That particular article references a book that used it as a central puzzle, which seems rather apt given the subject of the final two Picard episodes

Recognizing the letters can be re-arranged into another sentence may provide the answers. I Tego Arcana Dei translates to Begone! I conceal God’s Secrets. This sentence is found in the warning for the Maranatha puzzle. Along with Et in Arcadia Ego, it may warn a reader what action must be taken in order to be able to enter ‘Arcadia’ (state of being or place). The changing process used to reveal the hidden message (through the use of the anagram), could hint at and share this wisdom. It could be the necessity of change within. The essential action of changing conceals God’s Secrets.

The two final episodes center around

the mysterious message the Tash Val found, and the unraveling secrets of that message

which would make the name apt.

It's a reference to a rather mysterious phrase used by several painters

Many articles are written about the mysterious phrase. They try to explain the origin of the words or what the phrase is specifically meant to express. Written in Latin, the words ‘Et in Arcadia Ego’ roughly translate to ‘even in Arcadia I’ or ‘And in Arcadia I go’. Because of the phrase’s seemingly unfinished thought and the scene in which it is part of, many consider the conveyance of the words to be ‘that even in Arcadia (paradise) death is inevitable’; that time did not allow for a completion.

That particular article references a book that used it as a central puzzle, which seems rather apt given the subject of the final two Picard episodes

Recognizing the letters can be re-arranged into another sentence may provide the answers. I Tego Arcana Dei translates to Begone! I conceal God’s Secrets. This sentence is found in the warning for the Maranatha puzzle. Along with Et in Arcadia Ego, it may warn a reader what action must be taken in order to be able to enter ‘Arcadia’ (state of being or place). The changing process used to reveal the hidden message (through the use of the anagram), could hint at and share this wisdom. It could be the necessity of change within. The essential action of changing conceals God’s Secrets.

The two final episodes center around

the mysterious message the Zhat Vash found, and the unraveling secrets of that message, which apparently contain some sort of way to contact a "super-race" of artificial life

which would make the name apt.