Someone said Quentine so I gonna guess Quentin, it start by a Q and you might get be 25, or as it's a french name you might come from the 25th department (I have myself a lot of nicknames ending by 45)
This, or we have to be in the guild for the whole season to get the reward (or our rating need to count in guild, so we have to be in for 7 days (I think it's that)