國姓

国 = 囗 + 玉 : Mnemonic symbol: a nation's flag. Let's say the Chinese flag.

In the observatory's kitchen (o2) Gitta Giraffe (gu) is practising her ballet performance. She got a whole crate (囗) full of jade bracelets (玉) and flags (国) and fixed one flag to each jade bracelet. This makes a perfect combination for throwing the ring with the flag waving behind it and catching the ring again after a few pirouettes.

姓 = 女 + 生 : Marie Curie (xi) finds baby Bessie (女) lying in a cradle (生) in the engine's bathroom ((e)ng4). Marie decides to give Bessie the surname (姓) "Coleman" because she thinks it will fit very well.