JoyBoy and Davy Jones's bounty worth in modern age

Oda loves doing puns with high bounties like Whitebeard (5,046,000,000 -> 46=shiro(white)) and Roger (5,564,800,000 -> 648= Ro Ji Ya (Roger)), so I wanted to try giving an estimation of what worth could be attributed to Joyboy and Davy D. Jones, who Imu seems to fear equally, in the same way Oda has done..

I put myself 2 conditions:
- They must be close in amount
- Significantly higher than Roger's bounty without going too far.

For Joyboy, I simply used "Joy" from his name for the reasoning. Joy --> Happy --> Ha (8) Pi (π).
Joyboy's current worth would then be:

8,314,000,000 Berries

For Davy Jones, I tried a different logic. I chose to use the key element that allowed to first learn about him: the Davy Back Fight.
Back Fight --> Baku Faito --> Ba(8) Ku(9) Fa(4) I(1) To(10).
However, since I wanted to get them close, I chose not to use Ku (9) but instead use Ko, which can not only be used as a 9 but also as a 5, closer to the 3 Joyboy has. Since "Back" could somehow still be pronounced "bãko" since it's close to "bãku", I allowed myself to use this instead.
Jones' current worth would be:

8,541,100,000 Berries.

Both around 3 billions above Roger, way above, but not absurdly.