The word "strider" is a transparent Modern English compound built from the native verb "stride" and the agent suffix "-er." The verb "stride" itself has ancient Germanic roots, traceable to the Old English strīdan, meaning to stride or straddle, which is related to words in other Germanic languages connoting a long, vigorous step. The suffix "-er," one of the most productive in English for forming agent nouns, originates from the Old English -ere, used to denote a person or thing associated with an action. Therefore, a "strider" literally means "one who strides," a logical and direct descriptor for a long-legged walker or, by metaphorical extension, an insect that appears to "stride" across the water's surface.

Structure: stride (verb) + er (agent suffix) - stride: From Old English strīdan (to stride, straddle), of Germanic origin. It functions as the core verb root. - er: From Old English -ere, an agent-noun suffix, from Proto-Germanic. It functions to form a noun denoting "one who performs the action of the verb."