Edit fiddle - JSFiddle - React, Tailwind, and code Playground

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HTML

<input name="crmForm$lastname" type="text" maxlength="50" id="crmForm_lastname" tabindex="2080" class="textBox" onblur="crmForm_lastname_onblur.apply(this, [this]);" style="width: 496px;">

JavaScript

function crmForm_lastname_onblur(sourceField, sourceRowId) {
    var val = sourceField.value;
    
    if (val.charAt(0).toUpperCase() != val.charAt(0)) sourceField.value = val.charAt(0).toUpperCase() + val.slice(1)
}

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JSFiddle - React, Tailwind, and code Playground

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