I don’t know about Dragonflight, but D’Artagnan was a living person and the apostrophe means in French language usually a left out vowel. “De Artagnan”- From Artagnan.

The French language has a different system about vowels than the English language. So if most words end with a spoken vowel (usually e in the end), will lead to a shortened contraction bound by an apostrophe.

de Aria – d’Aria (from Aria) quelque un – quelqu’un – someone jusque à – jusqu’à – until ce est – c’est

It usually is used – as you can see – with “de”, “ce” and “que” – which are often used in a sentence in the French language. Also, this is for a more fluent language when speaking, so the syntax keeps intact.

English language takes the contraction from the following word: I will – I’ll I have – I’ve I am – I’m I had/I would – I’d