I’m seeing this going around again and I need to clear it up:
“Ikusaba” does not mean “battlefield”. It means “battle/war blade/knife/sword”.
The word for battlefield is “senjou” and it is written like this: 戦場.
The first character is indeed the same as Ikusaba, meaning “war” or “battle”, but because it is part of a compound noun rather than a stupid made-up name, you read it with the onyomi (Chinese) reading.
The second character can be read as “ba” in certain contexts where it uses kunyomi (Japanese reading)--like “basho” (place) for instance--but in the word “battlefield” it’s pronounced “jou”.
So you could maybe make the case that イクサバ could be written as 戦場 which would be the same characters as “battlefield” but not the same pronunciation, but it’s hardly the main intended meaning (if it were, Kodaka would have just made her name be written 戦場). I’m not sure how many average Japanese fans would even think about the name long enough to be like “oh well if you read the first kanji with onyomi instead and changed the second one to a totally different kanji where the kunyomi is the same as the onyomi for ‘yaiba’, then it would be written like ‘senjou’!”
Like it’s kind of a neat coincidence and maybe Kodaka did put that much thought into it, but the primary translation of Mukuro’s stupid last name should not be “battlefield”. Knives and blades are featured way too prominently in all of her appearances for that 刃 part to be dropped in favor of a really convoluted pun that may or may not have even been intended in the first place.
Basically: the blade/knife/sword part is important, guys. Please stop leaving it out.