I have a long list of name in order of `Family name, First name`. I'd like to change this to `First name Last name` with vim.

What is the best way. Thank you for your help.

```
Berclaz, Lucy
Carlow, Rese
Chang, Karen
DiCanilo, Sophy
Hisaeda, Kai
...
...

```

to 

```
Lucy Berclaz
Rese Carlow
Karen Chang
Sophy DiCanilo
Kai Hisaeda

```