In chapter 957 the bounties of all the Yonko as well as Whitebeard and Roger are revealed. And they all have a pun on it.
Their bounties’ meaning in Japanese:
Shanks’s 4,048,900,000: 4890 – Shanks (4=shi 8=ya 9=ku)
Big Mom’s 4,388,000,000: 8800 – haha = mother (8=ha)