Why does Rachel call herself Rachel Grey now instead of Rachel Summers?
Officially, Rachel took last name Grey to honour and pay tribute to her mother. Unofficially, it’s also do the fact that she is upset Scott and his relationship with Emma Frost. That reason hasn’t been explicitly stated in a comic, but Rachel had been very clear about her dislike of her father’s relationship (especially in X-Men Unlimited #11) The usage of Grey vs Summers tends to vary. In Uncanny X-Men 472, Colonel Reyes calls her Rachel Summers, but in Uncanny 475, she’s back to Grey. Marvel isn’t consistent either. On Marvel.com, Rachel is still listed as Rachel Summers with Rachel Grey as an alias, in Marvel Spotlight: Ed Brubaker/ Billy Tan, she’s called Rachel Summers, and in the 198 Files, her name is listed as Rachel Summers.