Kloxo will create mysql database name (as the same as database username) with limitation 16 chars.
Imagine, your client is 'client1' (7 chars) and your client database name (also their username) is 'client1_wordpress' (17 chars) and it's not permit. Possible as 'client1_wordpres' (16 chars; only with single 's').
Truely, in mysql, only database username with limiting to 16 chars. Database name able until 64 chars.
I have a plan to change mysql naming rule where database name able until 59 chars (because 4 chars as 'random alphanumeric' and 1 as '_') and database username is the same as client name (max 16 chars).
So, for 'client1', database name will be '1a6z_wordpress' and database username also as 'client1'.