汤姆 (Tāngmǔ) is the standard Chinese transliteration of the English name "Tom." Foreign names are typically rendered in Chinese characters that approximate their pronunciation. This is a common example of phonetic borrowing in Chinese.
汤姆是我在大学认识的美国朋友。
tāngmǔ shì wǒ zài dàxué rènshi de měiguó péngyǒu.
Tom is an American friend I met in college.
汤姆的中文说得越来越好了。
tāngmǔ de zhōngwén shuō de yuèláiyuè hǎo le.
Tom's Chinese is getting better and better.
你跟汤姆说一声,让他明天早点来。
nǐ gēn tāngmǔ shuō yī shēng, ràng tā míngtiān zǎodiǎn lái.
Tell Tom to come a bit earlier tomorrow.