I think Chiff gets a grade A+.
Everyone's combined answers pretty much got the correct result.
Yes, the trap was the Sei, which Nano correctly guessed is my wife's Japanese surname.
Sei is an unusual name in Japan. There are only two small clumps of it - one here at the foot of Mt.Fuji and the other in northern Japan. Most Japanese people outside of those areas find it difficult to read. It is written with the character for clean/pure.
As for the Irish part of the name, Chrisoff sent me a PM first saying it was Farquar - correct.
The Scottish version is most commonly Farquar or Farquarson.
The are many different version in both Ireland and Scotland. The closest to the original Irish is said to be McKerracher. Other version include Caraher, Carragher, MacCarehir and many variations of those.
The name is made up from the words Fear 'man' and Chara 'friend.' Fearchair was a male first name and it is most common in Monaghan and Louth.
Nice work.
Mukade
'The people who play the flat pipes usually have more peace of mind. I like that.'
- Tony Mcmahon