name
佟 is a rare kanji used primarily in personal names. Its standalone meaning is unclear beyond that name usage.
佟 combines 亻 (person) with 冬 (winter), but the historical origin and original meaning are uncertain. It is likely a phono-semantic compound created for use in names.
A person 亻 associated with winter 冬, perhaps a name given to someone born in that season. Remember 佟 as a name kanji.
For トウ, imagine a person named 佟 (とう) walking through the winter snow: the sound とう is like the English word 'toe', and you picture their cold toes in winter.
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