From Wikipedia:
Ichigo's name, written with homophone kanji, means 1 and 5 when separated as ichi (一) and go (五), the reason behind the two numbers' frequent appearances in the series, notably on the sampler hanging on his bedroom door. The word ichigo (苺/イチゴ), written in yet another way, means "strawberry" —one of his nicknames— in Japanese, and is normally only used as a girl's name; when teased about this fact, Ichigo proudly counters that his name is spelled with ichi (一) as in "first" and go (護) from "guardian". Ichigo's father once told him that his name means "he who protects." The name also means 'one's lifetime.'[16]