In old texts 佗 can be borrowed for the word "other".
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Most learners meet this character only in the name 华佗, the legendary Han-dynasty surgeon credited with early anesthesia. Its plain meaning is 'to carry on the back' (a variant of 驮); in classical texts it was also borrowed to write 他 'other'.
The side-person radical 亻, the left form of 人. It marks 佗 as a person doing something - carrying a load - and supports its later use as a personal pronoun 'other (person)'.
The right side 它 supplies the sound (tā shifting to tuó). The same phonetic core appears in 驮 'to carry on an animal's back' and 陀, a tight tuó sound family.
