Not sure if I qualify as a synesthete (see comment above), but I wonder if there's a "moon" influence too. I picture most L names with some sort of yellow to them though, so there's that. I find that the first letter is more dominant or something. There's a bit of a general pattern to what colors things are. For example, L tends to be yellow, J tends to be orange, R tends to be red, and H is more likely to have a grayish haze to it.
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Current favorites:
Ephraim /
Tristram /
Benedict /
HamishCordelia /
Winifred /
Edith /
Margaret
Vote on my PNL:
http://www.behindthename.com/pnl/114016