How do you spell Lexi in British?

"Lexi" is a name that is spelled the same way in both American and British English.

However, it's worth noting that the pronunciation might differ slightly. Some British people might pronounce the "i" in "Lexi" as a short "i" sound, similar to the "i" in "bit", while others might pronounce it with a longer "ee" sound, as in "see".