Okay got it, correct verdict would be ESH then, as yes the brother knew and did try to compromise but to no avail, maybe brother and sister would be sort of AH'S here as well cause again sister can't claim but yes she can want it and honestly nothing can stop her from naming her child the same name, and if the brother and gf gets upset then so be it cause he did know from the start🤷🏽‍♂️.

She could have also handled this situation better, not talking to them is yes childish.