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Note added at 2002-11-22 19:04:34 (GMT)
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名づけ子: nazuke-go
教子: kyooshi
代子: daishi

If its gender is apparent from the context, you will not have to add ¥"男の¥" (otoko-no).


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Note added at 2002-11-22 19:07:33 (GMT)
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カイは私の（男の子の）名づけ子です。私は彼の［カイの］名づけ親［教母, 後見人］です。

Kai wa watashi no (otoko-no-ko no) nazuke-go desu.
Watashi wa kare no [kai no] nazuke-oya [kyoobo, kooken-nin] desu.


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Note added at 2002-11-22 19:09:12 (GMT)
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BTW, ¥"godmother¥" is ¥"名づけ親¥" (nazuke-oya), ¥"教母¥" (kyoobo), or ¥"後見人¥" (kooken-nin).

カイは私の名づけ子です。
私は彼の名づけ母（名づけ親）です。
kai wa watashi no nadukego desu
watashi wa kareno naduke haha (naduke oya)desu.

名付け親 is used more than 名づけ母

As a (lapsed) Japanese Catholic, I can tell you that I¥'ve never heard the term godson used in conversation or in newsletters, etc. Instead, we talk about being one¥'s 代母 (daibo = godmother) or 代父 (daifu = godfather). In your case, I¥'d say, ¥"私はカイの代母です。(watashi wa Kai no daibo desu),¥" or, ¥"I am Kai¥'s godmother.¥" This is immediately understood among Japanese Catholic people, but not among others. So if the family to whom you¥'re introducing your relationship isn¥'t Catholic, I suppose you have to explain the concept. 名付け親 (nazuke oya) only really applies to the person who named the godchild, which is not really what godmother/godfather is in most cases since the person¥'s name is usually picked out by someone else already....