[truehappiness]

It's possible that CMJK made up the title and Ayu just ran with it. I remember in a Q&A or something, either he or another composer mentioned that sometimes titles are Ayu's idea while other times they are their own. I think I saw online that originally "opening Run" was just titled Run by CMJK but it was changed to "opening Run" for the album.

I think the title probably has nothing to do with the lyrics and the title was chosen or kept because it felt right? The inspiration was probably obviously from Catcher in the Rye. In an interesting note, CMJK apparently did a remix for a Ghost in the Shell: SAC game in 2004 and GitS takes some inspiration from JD Salinger's work so perhaps that track was influenced by that?

The names also only differ by one character in Japanese.
Catcher in the Rye in katakana
キャッチャー・イン・ザ・ライ

Catcher in the Light in katakana
キャッチャー・イン・ザ・ライト