In English, many adverbs end in -ly. Adverbs modify verbs. Often, adjectives can be turned in to adverbs by adding -ly, as in the case of quick and quickly, or

In English, many adverbs end in -ly. Adverbs modify verbs. Often, adjectives can be turned in to adverbs by adding -ly, as in the case of quick and quickly, or sly and slyly. Obviously, Optimizely is like jumply, in that it doesn't make sense. But it sounds good, it's descriptive, and it was available. Also, it's probably better to make up a word rather than use an existing word so that it can be identified easier in search engines and conversation.