There are some characters whose names are derived from codepoints or other sources.
(See Section 4-8 and specifically Table 4-8 in the Unicode Core Specification)
Your website seems to use values from UnicodeData.txt directly, so it shows "<CJK Ideograph, First>" instead of "CJK UNIFIED IDEOGRAPH-4E00"
There are some characters whose names are derived from codepoints or other sources. (See Section 4-8 and specifically Table 4-8 in the Unicode Core Specification)
Your website seems to use values from UnicodeData.txt directly, so it shows "<CJK Ideograph, First>" instead of "CJK UNIFIED IDEOGRAPH-4E00"