伟

Left person radical - the side-form of 人, a walking figure compressed into two strokes. The indexing radical, marking 伟 as a quality describing a person: great, mighty, magnificent. Same radical groups 伟 with 仁 (benevolent), 信 (trustworthy), 健 (robust), 优 (excellent) - almost all human-trait adjectives sit here.

Right 韦 supplies the sound directly - wěi matches the whole reading. Simplified from 韋, which depicted feet circling a city (originally 'to encircle', source of 围). Same phonetic feeds 围 (surround), 违 (defy), 苇 (reed), 纬 (latitude) - all in the wéi/wěi family. Purely sound-bearing in 伟.